1
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Palacios G, Kundu S, Santos LAP, Gomes MAF. Physical properties of a generalized model of multilayer adsorption of dimers. Phys Rev E 2023; 108:034115. [PMID: 37849126 DOI: 10.1103/physreve.108.034115] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/23/2023] [Accepted: 09/06/2023] [Indexed: 10/19/2023]
Abstract
We investigate the transport properties of a complex porous structure with branched fractal architectures formed due to the gradual deposition of dimers in a model of multilayer adsorption. We thoroughly study the interplay between the orientational anisotropy parameter p_{0} of deposited dimers and the formation of porous structures, as well as its impact on the conductivity of the system, through extensive numerical simulations. By systematically varying the value of p_{0}, several critical and off-critical scaling relations characterizing the behavior of the system are examined. The results demonstrate that the degree of orientational anisotropy of dimers plays a significant role in determining the structural and physical characteristics of the system. We find that the Einstein relation relating to the size scaling of the electrical conductance holds true only in the limiting case of p_{0}→1. Monitoring the fractal dimension of the interface of the multilayer formation for various p_{0} values, we reveal that in a wide range of p_{0}>0.2 interface shows the characteristic of a self-avoiding random walk, compared to the limiting case of p_{0}→0 where it is characterized by the fractal dimension of the backbone of ordinary percolation cluster at criticality. Our results thus can provide useful information about the fundamental mechanisms underlying the formation and behavior of wide varieties of amorphous and disordered systems that are of paramount importance both in science and technology as well as in environmental studies.
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Affiliation(s)
- G Palacios
- CRCN-NE/CNEN, 50740-545, Recife, PE, Brazil
| | - Sumanta Kundu
- Department of Physics and Astronomy, University of Padova, I-35131 Padova, Italy
- INFN, Sezione di Padova, I-35131 Padova, Italy
| | - L A P Santos
- CRCN-NE/CNEN, 50740-545, Recife, PE, Brazil
- SCIENTS, 53635-015 Igarassu, PE, Brazil
| | - M A F Gomes
- Departamento de Física, Universidade Federal de Pernambuco, 50670-901 Recife, PE, Brazil
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2
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Palacios G, Santos LAP, Gomes MAF. Transport properties in multilayer adsorption of dimers. Phys Rev E 2022; 106:034120. [PMID: 36266888 DOI: 10.1103/physreve.106.034120] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/23/2022] [Accepted: 08/22/2022] [Indexed: 06/16/2023]
Abstract
In this paper, we study the transport properties (percolation and conductivity) of a two-dimensional structure created by depositing dimers on a one-dimensional substrate where multilayer deposition is allowed. Specifically, we are interested in studying how the mentioned properties vary as a function of the height of the multilayer. The critical parameters of the percolation transition are calculated using finite-size scaling analysis, obtaining the scaling laws for the probability of percolation and the conductivity of the system. To calculate the electrical conductivity of the multilayer, we use the Frank-Lobb algorithm.
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Affiliation(s)
- G Palacios
- CNEN/CRCN-NE, 50740-545, Recife, PE, Brazil
| | | | - M A F Gomes
- Departamento de Física, Universidade Federal de Pernambuco, 50670-901, Recife, PE, Brazil
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3
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Pfattner R, Laukhina E, Li J, Zaffino RL, Aliaga-Alcalde N, Mas-Torrent M, Laukhin V, Veciana J. Emergent Insulator-Metal Transition with Tunable Optical and Electrical Gap in Thin Films of a Molecular Conducting Composite. ACS APPLIED ELECTRONIC MATERIALS 2022; 4:2432-2441. [PMID: 35647553 PMCID: PMC9134344 DOI: 10.1021/acsaelm.2c00224] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 02/16/2022] [Accepted: 04/26/2022] [Indexed: 06/15/2023]
Abstract
Composites exhibit unique synergistic properties emerging when components with different properties are combined. The tuning of the energy bandgap in the electronic structure of the material allows designing tailor-made systems with desirable mechanical, electrical, optical, and/or thermal properties. Here, we study an emergent insulator-metal transition at room temperature in bilayered (BL) thin-films comprised of polycarbonate/molecular-metal composites. Temperature-dependent resistance measurements allow monitoring of the electrical bandgap, which is in agreement with the optical bandgap extracted by optical absorption spectroscopy. The semiconductor-like properties of BL films, made with bis(ethylenedithio)-tetrathiafulvalene (BEDT-TTF or ET) α-ET2I3 (nano)microcrystals as two-dimensional molecular conductor on one side and insulator polycarbonate as a second ingredient, are attributed to an emergent phenomenon equivalent to the transition from an insulator to a metal. This made it possible to obtain semiconducting BL films with tunable electrical/optical bandgaps ranging from 0 to 2.9 eV. A remarkable aspect is the similarity close to room temperature of the thermal and mechanical properties of both composite components, making these materials ideal candidates to fabricate flexible and soft sensors for stress, pressure, and temperature aiming at applications in wearable human health care and bioelectronics.
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Affiliation(s)
- Raphael Pfattner
- Institut
de Ciència de Materials de Barcelona (ICMAB-CSIC), Campus UAB, 08193 Bellaterra, Spain
- Networking
Research Center on Bioengineering Biomaterials and Nanomedicine (CIBER-BBN), Campus UAB, 08193 Bellaterra, Spain
| | - Elena Laukhina
- Networking
Research Center on Bioengineering Biomaterials and Nanomedicine (CIBER-BBN), Campus UAB, 08193 Bellaterra, Spain
| | - Jinghai Li
- Institut
de Ciència de Materials de Barcelona (ICMAB-CSIC), Campus UAB, 08193 Bellaterra, Spain
| | - Rossella L. Zaffino
- Institut
de Ciència de Materials de Barcelona (ICMAB-CSIC), Campus UAB, 08193 Bellaterra, Spain
| | - Núria Aliaga-Alcalde
- Institut
de Ciència de Materials de Barcelona (ICMAB-CSIC), Campus UAB, 08193 Bellaterra, Spain
- ICREA−Institució
Catalana de Recerca i Estudis Avançats, Passeig Lluis Companys 23, 08010 Barcelona, Spain
| | - Marta Mas-Torrent
- Institut
de Ciència de Materials de Barcelona (ICMAB-CSIC), Campus UAB, 08193 Bellaterra, Spain
- Networking
Research Center on Bioengineering Biomaterials and Nanomedicine (CIBER-BBN), Campus UAB, 08193 Bellaterra, Spain
| | - Vladimir Laukhin
- Institut
de Ciència de Materials de Barcelona (ICMAB-CSIC), Campus UAB, 08193 Bellaterra, Spain
- Networking
Research Center on Bioengineering Biomaterials and Nanomedicine (CIBER-BBN), Campus UAB, 08193 Bellaterra, Spain
- ICREA−Institució
Catalana de Recerca i Estudis Avançats, Passeig Lluis Companys 23, 08010 Barcelona, Spain
| | - Jaume Veciana
- Institut
de Ciència de Materials de Barcelona (ICMAB-CSIC), Campus UAB, 08193 Bellaterra, Spain
- Networking
Research Center on Bioengineering Biomaterials and Nanomedicine (CIBER-BBN), Campus UAB, 08193 Bellaterra, Spain
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4
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Walker SM, Patel T, Okamoto J, Langenberg D, Bergeron EA, Gao J, Luo X, Lu W, Sun Y, Tsen AW, Baugh J. Observation and Manipulation of a Phase Separated State in a Charge Density Wave Material. NANO LETTERS 2022; 22:1929-1936. [PMID: 35176209 DOI: 10.1021/acs.nanolett.1c04514] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/14/2023]
Abstract
The 1T polytype of TaS2 has been studied extensively as a strongly correlated system. As 1T-TaS2 is thinned toward the 2D limit, its phase diagram shows significant deviations from that of the bulk material. Optoelectronic maps of ultrathin 1T-TaS2 have indicated the presence of nonequilibrium charge density wave phases within the hysteresis region of the nearly commensurate (NC) to commensurate (C) transition. We perform scanning tunneling microscopy on exfoliated ultrathin flakes of 1T-TaS2 within the NC-C hysteresis window, finding evidence that the observed nonequilibrium phases consist of intertwined, irregularly shaped NC-like and C-like domains. After applying lateral electrical signals to the sample, we image changes in the geometric arrangement of the different regions. We use a phase separation model to explore the relationship between electronic inhomogeneity present in ultrathin 1T-TaS2 and its bulk resistivity. These results demonstrate the role of phase competition morphologies in determining the properties of 2D materials.
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Affiliation(s)
- Sean M Walker
- Institute for Quantum Computing, University of Waterloo, Waterloo, Ontario N2L 3G1, Canada
- Department of Chemistry, University of Waterloo, Waterloo, Ontario N2L 3G1, Canada
| | - Tarun Patel
- Institute for Quantum Computing, University of Waterloo, Waterloo, Ontario N2L 3G1, Canada
- Department of Physics, University of Waterloo, Waterloo, Ontario N2L 3G1, Canada
| | - Junichi Okamoto
- Institute of Physics, University of Freiburg, D-79104 Freiburg, Germany
- EUCOR Centre for Quantum Science and Quantum Computing, University of Freiburg, D-79104 Freiburg, Germany
| | - Deler Langenberg
- Institute for Quantum Computing, University of Waterloo, Waterloo, Ontario N2L 3G1, Canada
| | - E Annelise Bergeron
- Institute for Quantum Computing, University of Waterloo, Waterloo, Ontario N2L 3G1, Canada
- Department of Physics, University of Waterloo, Waterloo, Ontario N2L 3G1, Canada
| | - Jingjing Gao
- Key Laboratory of Materials Physics, Institute of Solid State Physics, Chinese Academy of Sciences, Hefei 230031, People's Republic of China
| | - Xuan Luo
- Key Laboratory of Materials Physics, Institute of Solid State Physics, Chinese Academy of Sciences, Hefei 230031, People's Republic of China
| | - Wenjian Lu
- Key Laboratory of Materials Physics, Institute of Solid State Physics, Chinese Academy of Sciences, Hefei 230031, People's Republic of China
| | - Yuping Sun
- Key Laboratory of Materials Physics, Institute of Solid State Physics, Chinese Academy of Sciences, Hefei 230031, People's Republic of China
- High Magnetic Field Laboratory, Chinese Academy of Sciences, Hefei 230031, People's Republic of China
- Collaborative Innovation Centre of Advanced Microstructures, Nanjing University, Nanjing 210093, People's Republic of China
| | - Adam W Tsen
- Institute for Quantum Computing, University of Waterloo, Waterloo, Ontario N2L 3G1, Canada
- Department of Chemistry, University of Waterloo, Waterloo, Ontario N2L 3G1, Canada
| | - Jonathan Baugh
- Institute for Quantum Computing, University of Waterloo, Waterloo, Ontario N2L 3G1, Canada
- Department of Chemistry, University of Waterloo, Waterloo, Ontario N2L 3G1, Canada
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5
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Meng X, Gao J, Havlin S. Concurrence Percolation in Quantum Networks. PHYSICAL REVIEW LETTERS 2021; 126:170501. [PMID: 33988406 DOI: 10.1103/physrevlett.126.170501] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/13/2020] [Accepted: 03/24/2021] [Indexed: 06/12/2023]
Abstract
Establishing long-distance quantum entanglement, i.e., entanglement transmission, in quantum networks (QN) is a key and timely challenge for developing efficient quantum communication. Traditional comprehension based on classical percolation assumes a necessary condition for successful entanglement transmission between any two infinitely distant nodes: they must be connected by at least a path of perfectly entangled states (singlets). Here, we relax this condition by explicitly showing that one can focus not on optimally converting singlets but on establishing concurrence-a key measure of bipartite entanglement. We thereby introduce a new statistical theory, concurrence percolation theory (ConPT), remotely analogous to classical percolation but fundamentally different, built by generalizing bond percolation in terms of "sponge-crossing" paths instead of clusters. Inspired by resistance network analysis, we determine the path connectivity by series and parallel rules and approximate higher-order rules via star-mesh transforms. Interestingly, we find that the entanglement transmission threshold predicted by ConPT is lower than the known classical-percolation-based results and is readily achievable on any series-parallel networks such as the Bethe lattice. ConPT promotes our understanding of how well quantum communication can be further systematically improved versus classical statistical predictions under the limitation of QN locality-a "quantum advantage" that is more general and efficient than expected. ConPT also shows a percolationlike universal critical behavior derived by finite-size analysis on the Bethe lattice and regular two-dimensional lattices, offering new perspectives for a theory of criticality in entanglement statistics.
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Affiliation(s)
- Xiangyi Meng
- Center for Polymer Studies and Department of Physics, Boston University, Boston, Massachusetts 02215, USA
- Center for Complex Network Research and Department of Physics, Northeastern University, Boston, Massachusetts 02115, USA
| | - Jianxi Gao
- Department of Computer Science, Rensselaer Polytechnic Institute, Troy, New York 12180, USA
| | - Shlomo Havlin
- Center for Polymer Studies and Department of Physics, Boston University, Boston, Massachusetts 02215, USA
- Department of Physics, Bar-Ilan University, 52900 Ramat-Gan, Israel
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6
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Lebovka NI, Tatochenko MO, Vygornitskii NV, Eserkepov AV, Akhunzhanov RK, Tarasevich YY. Connectedness percolation in the random sequential adsorption packings of elongated particles. Phys Rev E 2021; 103:042113. [PMID: 34005923 DOI: 10.1103/physreve.103.042113] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/11/2020] [Accepted: 03/11/2021] [Indexed: 11/07/2022]
Abstract
Connectedness percolation phenomena in the two-dimensional packing of elongated particles (discorectangles) were studied numerically. The packings were produced using random sequential adsorption off-lattice models with preferential orientations of the particles along a given direction. The partial ordering was characterized by the order parameter S, with S=0 for completely disordered films (random orientation of particles) and S=1 for completely aligned particles along the horizontal direction x. The aspect ratio (length-to-width ratio) of the particles was varied within the range ɛ∈[1;100]. Analysis of connectivity was performed assuming a core-shell structure of the particles. The value of S affected the structure of the packings, the formation of long-range connectivity, and the behavior of the electrical conductivity. The effects can be explained by taking accounting of the competition between the particles' orientational degrees of freedom and excluded volume effects. For aligned deposition, anisotropy in the electrical conductivity was observed with the values along the alignment direction σ_{x} being larger than the values in the perpendicular direction σ_{y}. Anisotropy in the localization of the percolation threshold was also observed in finite-sized packings, but it disappeared in the limit of infinitely large systems.
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Affiliation(s)
- Nikolai I Lebovka
- Laboratory of Physical Chemistry of Disperse Minerals, F. D. Ovcharenko Institute of Biocolloidal Chemistry, NAS of Ukraine, Kyiv 03142, Ukraine.,Department of Physics, Taras Shevchenko Kiev National University, Kyiv 01033, Ukraine
| | - Mykhailo O Tatochenko
- Laboratory of Physical Chemistry of Disperse Minerals, F. D. Ovcharenko Institute of Biocolloidal Chemistry, NAS of Ukraine, Kyiv 03142, Ukraine
| | - Nikolai V Vygornitskii
- Laboratory of Physical Chemistry of Disperse Minerals, F. D. Ovcharenko Institute of Biocolloidal Chemistry, NAS of Ukraine, Kyiv 03142, Ukraine
| | - Andrei V Eserkepov
- Laboratory of Mathematical Modeling, Astrakhan State University, Astrakhan 414056, Russia
| | - Renat K Akhunzhanov
- Laboratory of Mathematical Modeling, Astrakhan State University, Astrakhan 414056, Russia
| | - Yuri Yu Tarasevich
- Laboratory of Mathematical Modeling, Astrakhan State University, Astrakhan 414056, Russia
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7
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Lebovka NI, Tarasevich YY, Bulavin LA, Kovalchuk VI, Vygornitskii NV. Sedimentation of a suspension of rods: Monte Carlo simulation of a continuous two-dimensional problem. Phys Rev E 2019; 99:052135. [PMID: 31212574 DOI: 10.1103/physreve.99.052135] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/27/2019] [Indexed: 06/09/2023]
Abstract
The sedimentation of a two-dimensional suspension containing rods was studied by means of Monte Carlo (MC) simulations. An off-lattice model with continuous positional and orientational degrees of freedom was considered. The initial state before sedimentation was produced using a model of random sequential adsorption. During such sedimentation, the rods undergo translational and rotational Brownian motions. The MC simulations were run at different initial number densities (the numbers of rods per unit area), ρ_{i}, and sedimentation rates, u. For sediment films, the spatial distributions of the rods, the order parameters, and the electrical conductivities were examined. Different types of sedimentation-driven self-assembly and anisotropy of the electrical conductivity were revealed inside the sediment films. This anisotropy can be finely regulated by changes in the values of ρ_{i} and u.
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Affiliation(s)
- Nikolai I Lebovka
- Department of Physical Chemistry of Disperse Minerals, F. D. Ovcharenko Institute of Biocolloidal Chemistry, NAS of Ukraine, Kiev, Ukraine 03142
- Department of Physics, Taras Shevchenko Kiev National University, Kiev, Ukraine 01033
| | - Yuri Yu Tarasevich
- Laboratory of Mathematical Modeling, Astrakhan State University, Astrakhan, Russia 414056
| | - Leonid A Bulavin
- Department of Physics, Taras Shevchenko Kiev National University, Kiev, Ukraine 01033
| | - Valery I Kovalchuk
- Department of Physics, Taras Shevchenko Kiev National University, Kiev, Ukraine 01033
| | - Nikolai V Vygornitskii
- Department of Physical Chemistry of Disperse Minerals, F. D. Ovcharenko Institute of Biocolloidal Chemistry, NAS of Ukraine, Kiev, Ukraine 03142
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8
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Lebovka NI, Tarasevich YY, Vygornitskii NV, Eserkepov AV, Akhunzhanov RK. Anisotropy in electrical conductivity of films of aligned intersecting conducting rods. Phys Rev E 2018; 98:012104. [PMID: 30110796 DOI: 10.1103/physreve.98.012104] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/20/2018] [Indexed: 11/07/2022]
Abstract
Numerical simulations by means of the Monte Carlo method have been performed to study the electrical properties of a two-dimensional composite filled with rodlike particles. The main goal was to study the effect of the alignment of such rods on the anisotropy of its electrical conductivity. A continuous model was used. In this model, the rods have zero-width (i.e., infinite aspect ratio) and they may intersect each other. To involve both the low conductive host matrix and highly conductive fillers (rods) in the consideration, a discretization algorithm based on the use of a supporting mesh was applied. The discretization is equivalent to the substitution of rods with the polyominoes. Once discretized, the Frank-Lobb algorithm was applied to evaluate the electrical conductivity. Our main findings are (i) the alignment of the rods essentially affects the electrical conductivity and its anisotropy, (ii) the discrete nature of computer simulations is crucial. For slightly disordered system, high electrical anisotropy was observed at small filler content, suggesting a method to enable the production of optically transparent and highly anisotropic conducting films.
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Affiliation(s)
- Nikolai I Lebovka
- Department of Physical Chemistry of Disperse Minerals, F. D. Ovcharenko Institute of Biocolloidal Chemistry, NAS of Ukraine, Kiev, Ukraine, 03142.,Department of Physics, Taras Shevchenko Kiev National University, Kiev, Ukraine, 01033
| | - Yuri Yu Tarasevich
- Laboratory of Mathematical Modeling, Astrakhan State University, Astrakhan, Russia, 414056
| | - Nikolai V Vygornitskii
- Department of Physical Chemistry of Disperse Minerals, F. D. Ovcharenko Institute of Biocolloidal Chemistry, NAS of Ukraine, Kiev, Ukraine, 03142
| | - Andrei V Eserkepov
- Laboratory of Mathematical Modeling, Astrakhan State University, Astrakhan, Russia, 414056
| | - Renat K Akhunzhanov
- Laboratory of Mathematical Modeling, Astrakhan State University, Astrakhan, Russia, 414056
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9
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Tarasevich YY, Lebovka NI, Vodolazskaya IV, Eserkepov AV, Goltseva VA, Chirkova VV. Anisotropy in electrical conductivity of two-dimensional films containing aligned nonintersecting rodlike particles: Continuous and lattice models. Phys Rev E 2018; 98:012105. [PMID: 30110826 DOI: 10.1103/physreve.98.012105] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/02/2018] [Indexed: 06/08/2023]
Abstract
The electrical conductivity of two-dimensional films filled with rodlike particles (rods) was simulated by the Monte Carlo method. The main attention has been paid to the investigation of the effect of the rod alignment on the electrical properties of the films. Both continuous and lattice approaches were used. Intersections of particles were forbidden. Our main findings are (i) both models demonstrate similar behaviors, (ii) at low concentration of rods, both approaches lead to the same dependencies of the electrical conductivity on the concentration of the rods, (iii) the alignment of the rods essentially affects the electrical conductivity, (iv) at some concentrations of partially aligned rods, the films may be conducting only in one direction, and (v) the films may simultaneously be both highly transparent and electrically anisotropic.
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Affiliation(s)
- Yuri Yu Tarasevich
- Laboratory of Mathematical Modeling, Astrakhan State University, Astrakhan, Russia, 414056
| | - Nikolai I Lebovka
- Department of Physical Chemistry of Disperse Minerals, F. D. Ovcharenko Institute of Biocolloidal Chemistry, NAS of Ukraine, Kiev, Ukraine, 03142
- Department of Physics, Taras Shevchenko Kiev National University, Kiev, Ukraine, 01033
| | - Irina V Vodolazskaya
- Laboratory of Mathematical Modeling, Astrakhan State University, Astrakhan, Russia, 414056
| | - Andrei V Eserkepov
- Laboratory of Mathematical Modeling, Astrakhan State University, Astrakhan, Russia, 414056
| | - Valeria A Goltseva
- Laboratory of Mathematical Modeling, Astrakhan State University, Astrakhan, Russia, 414056
| | - Valentina V Chirkova
- Laboratory of Mathematical Modeling, Astrakhan State University, Astrakhan, Russia, 414056
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10
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Melnikov AV, Shuba M, Lambin P. Modeling the electrical properties of three-dimensional printed meshes with the theory of resistor lattices. Phys Rev E 2018; 97:043307. [PMID: 29758615 DOI: 10.1103/physreve.97.043307] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/31/2017] [Indexed: 06/08/2023]
Abstract
The electrical properties of conducting meshes are investigated numerically by solving the related Kirchhoff equations with the Lanczos algorithm. The method is directly inspired by the recursion technique widely used to study the electronic and vibrational spectra of solids. The method is demonstrated to be very efficient and fast when applied to resistor networks. It is used to calculate equivalent resistances between arbitrary pairs of nodes in simple resistive lattices. When the resistance fluctuates statistically from bond to bond, the method makes it possible to evaluate the fluctuations of the electrical properties of the network. It is also employed to assign an effective bulk resistivity to a discrete conducting three-dimensional mesh.
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Affiliation(s)
- Alexander V Melnikov
- Institute for Nuclear Problems, Belarus State University, Bobruiskaya 11, 220050 Minsk, Belarus
| | - Mikhail Shuba
- Institute for Nuclear Problems, Belarus State University, Bobruiskaya 11, 220050 Minsk, Belarus
- Tomsk State University, 36 Lenin Avenue, Tomsk 634050, Russia
| | - Philippe Lambin
- Physics Department, Université de Namur, 61 Rue de Bruxelles, B-5000 Namur, Belgium
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11
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Lebovka NI, Tarasevich YY, Vygornitskii NV. Vertical drying of a suspension of sticks: Monte Carlo simulation for continuous two-dimensional problem. Phys Rev E 2018; 97:022136. [PMID: 29548252 DOI: 10.1103/physreve.97.022136] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/30/2017] [Indexed: 11/07/2022]
Abstract
The vertical drying of a two-dimensional colloidal film containing zero-thickness sticks (lines) was studied by means of kinetic Monte Carlo (MC) simulations. The continuous two-dimensional problem for both the positions and orientations was considered. The initial state before drying was produced using a model of random sequential adsorption with isotropic orientations of the sticks. During the evaporation, an upper interface falls with a linear velocity in the vertical direction, and the sticks undergo translational and rotational Brownian motions. The MC simulations were run at different initial number concentrations (the numbers of sticks per unit area), p_{i}, and solvent evaporation rates, u. For completely dried films, the spatial distributions of the sticks, the order parameters, and the electrical conductivities of the films in both the horizontal, x, and vertical, y, directions were examined. Significant evaporation-driven self-assembly and stratification of the sticks in the vertical direction was observed. The extent of stratification increased with increasing values of u. The anisotropy of the electrical conductivity of the film can be finely regulated by changes in the values of p_{i} and u.
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Affiliation(s)
- Nikolai I Lebovka
- Department of Physical Chemistry of Disperse Minerals, F. D. Ovcharenko Institute of Biocolloidal Chemistry, NAS of Ukraine, Kiev, Ukraine, 03142.,Department of Physics, Taras Shevchenko Kiev National University, Kiev, Ukraine, 01033
| | - Yuri Yu Tarasevich
- Laboratory of Mathematical Modeling, Astrakhan State University, Astrakhan, Russia, 414056
| | - Nikolai V Vygornitskii
- Department of Physical Chemistry of Disperse Minerals, F. D. Ovcharenko Institute of Biocolloidal Chemistry, NAS of Ukraine, Kiev, Ukraine, 03142
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12
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Loh YL, Karki P. Dielectric and diamagnetic susceptibilities near percolative superconductor-insulator transitions. JOURNAL OF PHYSICS. CONDENSED MATTER : AN INSTITUTE OF PHYSICS JOURNAL 2017; 29:425901. [PMID: 28829339 DOI: 10.1088/1361-648x/aa879d] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
Coarse-grained superconductor-insulator composites exhibit a superconductor-insulator transition governed by classical percolation, which should be describable by networks of inductors and capacitors. We study several classes of random inductor-capacitor networks on square lattices. We present a unifying framework for defining electric and magnetic response functions, and we extend the Frank-Lobb bond-propagation algorithm to compute these quantities by network reduction. We confirm that the superfluid stiffness scales approximately as [Formula: see text] as the superconducting bond fraction p approaches the percolation threshold p c . We find that the diamagnetic susceptibility scales as [Formula: see text] below percolation, and as [Formula: see text] above percolation. For models lacking self-capacitances, the electric susceptibility scales as [Formula: see text]. Including a self-capacitance on each node changes the critical behavior to approximately [Formula: see text].
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Affiliation(s)
- Yen Lee Loh
- Department of Physics and Astrophysics, University of North Dakota, Grand Forks, ND 58202, United States of America
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13
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Lebovka NI, Tarasevich YY, Gigiberiya VA, Vygornitskii NV. Diffusion-driven self-assembly of rodlike particles: Monte Carlo simulation on a square lattice. Phys Rev E 2017; 95:052130. [PMID: 28618463 DOI: 10.1103/physreve.95.052130] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/06/2017] [Indexed: 11/07/2022]
Abstract
The diffusion-driven self-assembly of rodlike particles was studied by means of Monte Carlo simulation. The rods were represented as linear k-mers (i.e., particles occupying k adjacent sites). In the initial state, they were deposited onto a two-dimensional square lattice of size L×L up to the jamming concentration using a random sequential adsorption algorithm. The size of the lattice, L, was varied from 128 to 2048, and periodic boundary conditions were applied along both x and y axes, while the length of the k-mers (determining the aspect ratio) was varied from 2 to 12. The k-mers oriented along the x and y directions (k_{x}-mers and k_{y}-mers, respectively) were deposited equiprobably. In the course of the simulation, the numbers of intraspecific and interspecific contacts between the same sort and between different sorts of k-mers, respectively, were calculated. Both the shift ratio of the actual number of shifts along the longitudinal or transverse axes of the k-mers and the electrical conductivity of the system were also examined. For the initial random configuration, quite different self-organization behavior was observed for short and long k-mers. For long k-mers (k≥6), three main stages of diffusion-driven spatial segregation (self-assembly) were identified: the initial stage, reflecting destruction of the jamming state; the intermediate stage, reflecting continuous cluster coarsening and labyrinth pattern formation; and the final stage, reflecting the formation of diagonal stripe domains. Additional examination of two artificially constructed initial configurations showed that this pattern of diagonal stripe domains is an attractor, i.e., any spatial distribution of k-mers tends to transform into diagonal stripes. Nevertheless, the time for relaxation to the steady state essentially increases as the lattice size growth.
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Affiliation(s)
- Nikolai I Lebovka
- Department of Physical Chemistry of Disperse Minerals, F.D. Ovcharenko Institute of Biocolloidal Chemistry, NAS of Ukraine, Kiev, Ukraine, 03142 and Department of Physics, Taras Shevchenko Kiev National University, Kiev, Ukraine, 01033
| | - Yuri Yu Tarasevich
- Laboratory of Mathematical Modeling, Astrakhan State University, Astrakhan, Russia, 414056
| | - Volodymyr A Gigiberiya
- Department of Physical Chemistry of Disperse Minerals, F.D. Ovcharenko Institute of Biocolloidal Chemistry, NAS of Ukraine, Kiev, Ukraine, 03142
| | - Nikolai V Vygornitskii
- Department of Physical Chemistry of Disperse Minerals, F.D. Ovcharenko Institute of Biocolloidal Chemistry, NAS of Ukraine, Kiev, Ukraine, 03142
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Zhai C, Hanaor D, Gan Y. Universality of the emergent scaling in finite random binary percolation networks. PLoS One 2017; 12:e0172298. [PMID: 28207872 PMCID: PMC5312937 DOI: 10.1371/journal.pone.0172298] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/22/2016] [Accepted: 02/02/2017] [Indexed: 11/25/2022] Open
Abstract
In this paper we apply lattice models of finite binary percolation networks to examine the effects of network configuration on macroscopic network responses. We consider both square and rectangular lattice structures in which bonds between nodes are randomly assigned to be either resistors or capacitors. Results show that for given network geometries, the overall normalised frequency-dependent electrical conductivities for different capacitor proportions are found to converge at a characteristic frequency. Networks with sufficiently large size tend to share the same convergence point uninfluenced by the boundary and electrode conditions, can be then regarded as homogeneous media. For these networks, the span of the emergent scaling region is found to be primarily determined by the smaller network dimension (width or length). This study identifies the applicability of power-law scaling in random two phase systems of different topological configurations. This understanding has implications in the design and testing of disordered systems in diverse applications.
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Affiliation(s)
- Chongpu Zhai
- The School of Civil Engineering, The University of Sydney, Sydney, New South Wales, Australia
| | - Dorian Hanaor
- The School of Civil Engineering, The University of Sydney, Sydney, New South Wales, Australia
- Institute for Materials Science and Technology, Technische Universität Berlin, Berlin, Germany
| | - Yixiang Gan
- The School of Civil Engineering, The University of Sydney, Sydney, New South Wales, Australia
- * E-mail:
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15
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Lebovka NI, Vygornitskii NV, Gigiberiya VA, Tarasevich YY. Monte Carlo simulation of evaporation-driven self-assembly in suspensions of colloidal rods. Phys Rev E 2017; 94:062803. [PMID: 28085421 DOI: 10.1103/physreve.94.062803] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/18/2016] [Indexed: 11/07/2022]
Abstract
The vertical drying of a colloidal film containing rodlike particles was studied by means of kinetic Monte Carlo (MC) simulation. The problem was approached using a two-dimensional square lattice, and the rods were represented as linear k-mers (i.e., particles occupying k adjacent sites). The initial state before drying was produced using a model of random sequential adsorption (RSA) with isotropic orientations of the k-mers (orientation of the k-mers along horizontal x and vertical y directions are equiprobable). In the RSA model, overlapping of the k-mers is forbidden. During the evaporation, an upper interface falls with a linear velocity of u in the vertical direction and the k-mers undergo translation Brownian motion. The MC simulations were run at different initial concentrations, p_{i}, (p_{i}∈[0,p_{j}], where p_{j} is the jamming concentration), lengths of k-mers (k∈[1,12]), and solvent evaporation rates, u. For completely dried films, the spatial distributions of k-mers and their electrical conductivities in both x and y directions were examined. Significant evaporation-driven self-assembly and orientation stratification of the k-mers oriented along the x and y directions were observed. The extent of stratification increased with increasing value of k. The anisotropy of the electrical conductivity of the film can be finely regulated by changes in the values of p_{i}, k, and u.
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Affiliation(s)
- Nikolai I Lebovka
- Department of Physical Chemistry of Disperse Minerals, F. D. Ovcharenko Institute of Biocolloidal Chemistry, NAS of Ukraine, Kiev, Ukraine, 03142 and Department of Physics, Taras Shevchenko Kiev National University, Kiev, Ukraine, 01033
| | - Nikolai V Vygornitskii
- Department of Physical Chemistry of Disperse Minerals, F. D. Ovcharenko Institute of Biocolloidal Chemistry, NAS of Ukraine, Kiev, Ukraine, 03142
| | - Volodymyr A Gigiberiya
- Department of Physical Chemistry of Disperse Minerals, F. D. Ovcharenko Institute of Biocolloidal Chemistry, NAS of Ukraine, Kiev, Ukraine, 03142
| | - Yuri Yu Tarasevich
- Laboratory of Mathematical Modeling, Astrakhan State University, Astrakhan, Russia, 414056
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16
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Tarasevich YY, Goltseva VA, Laptev VV, Lebovka NI. Electrical conductivity of a monolayer produced by random sequential adsorption of linear k-mers onto a square lattice. Phys Rev E 2016; 94:042112. [PMID: 27841486 DOI: 10.1103/physreve.94.042112] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/28/2016] [Indexed: 06/06/2023]
Abstract
The electrical conductivity of a monolayer produced by the random sequential adsorption (RSA) of linear k-mers (particles occupying k adjacent adsorption sites) onto a square lattice was studied by means of computer simulation. Overlapping with predeposited k-mers and detachment from the surface were forbidden. The RSA process continued until the saturation jamming limit, p_{j}. The isotropic (equiprobable orientations of k-mers along x and y axes) and anisotropic (all k-mers aligned along the y axis) depositions for two different models-of an insulating substrate and conducting k-mers (C model) and of a conducting substrate and insulating k-mers (I model)-were examined. The Frank-Lobb algorithm was applied to calculate the electrical conductivity in both the x and y directions for different lengths (k=1 - 128) and concentrations (p=0 - p_{j}) of the k-mers. The "intrinsic electrical conductivity" and concentration dependence of the relative electrical conductivity Σ(p) (Σ=σ/σ_{m} for the C model and Σ=σ_{m}/σ for the I model, where σ_{m} is the electrical conductivity of substrate) in different directions were analyzed. At large values of k the Σ(p) curves became very similar and they almost coincided at k=128. Moreover, for both models the greater the length of the k-mers the smoother the functions Σ_{xy}(p),Σ_{x}(p) and Σ_{y}(p). For the more practically important C model, the other interesting findings are (i) for large values of k (k=64,128), the values of Σ_{xy} and Σ_{y} increase rapidly with the initial increase of p from 0 to 0.1; (ii) for k≥16, all the Σ_{xy}(p) and Σ_{x}(p) curves intersect with each other at the same isoconductivity points; (iii) for anisotropic deposition, the percolation concentrations are the same in the x and y directions, whereas, at the percolation point the greater the length of the k-mers the larger the anisotropy of the electrical conductivity, i.e., the ratio σ_{y}/σ_{x} (>1).
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Affiliation(s)
| | | | - Valeri V Laptev
- Astrakhan State University, Astrakhan, Russia and Astrakhan State Technical University, Astrakhan, Russia
| | - Nikolai I Lebovka
- F.D. Ovcharenko Institute of Biocolloidal Chemistry, NAS of Ukraine, Kiev, Ukraine and Taras Shevchenko Kiev National University, Department of Physics, Kiev, Ukraine
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Loh YL, Dhakal R, Neis JF, Moen EM. Divergence of dynamical conductivity at certain percolative superconductor-insulator transitions. JOURNAL OF PHYSICS. CONDENSED MATTER : AN INSTITUTE OF PHYSICS JOURNAL 2014; 26:505702. [PMID: 25420003 DOI: 10.1088/0953-8984/26/50/505702] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
Random inductor–capacitor (LC) networks can exhibit percolative superconductor-insulator transitions (SITs). We use a simple and efficient algorithm to compute the dynamicalconductivity σ(ω,p) of one type of LC network on large (4000 × 4000) square lattices, where δ = p − p(c) is the tuning parameter for the SIT. We confirm that the conductivity obeys a scaling form, so that the characteristic frequency scales as∝|δ|(νz) with νz ≈ 1.91, the superfluid stiffness scales as ϒ∝|δ|(t) with t ≈ 1.3, and the electric susceptibility scales as χE∝|δ|(−s) with s = 2νz − t ≈ 2.52. In the insulating state, the low-frequency dissipative conductivity is exponentially small, whereas in the superconductor, it is linear in frequency.The sign of Im σ(ω) at small ω changes across the SIT. Most importantly, we find that right at the SIT Re σ(ω) ∝ ω(t/νz−1)∝ω(−0.32), so that the conductivity diverges in the DC limit, in contrast with most other classical and quantum models of SITs.
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18
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Zhang GM. Higher order nonlinear response in random resistor networks: numerical studies for arbitrary nonlinearity. ACTA ACUST UNITED AC 2014. [DOI: 10.1007/s002570050082] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
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19
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Kim H, Mattevi C, Kim HJ, Mittal A, Mkhoyan KA, Riman RE, Chhowalla M. Optoelectronic properties of graphene thin films deposited by a Langmuir-Blodgett assembly. NANOSCALE 2013; 5:12365-12374. [PMID: 24162721 DOI: 10.1039/c3nr02907g] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/02/2023]
Abstract
Large area thin films of few-layered unfunctionalized graphene platelets are developed with fine control over the thickness. The thin films are obtained by a Langmuir-Blodgett assembly at the interface of graphene solution in N-methyl-2-pyrrolidone (NMP) and water, and their optoelectronic properties and conduction mechanism are investigated in relation to lateral flake size and thin film thickness. The electrical conductivity and carrier mobility are affected by the flake size (200 nm to 1 μm) and by the packing of the nanostructure platelet network. General effective medium theory is used to explain the thickness dependent conductivity and to determine the percolation threshold film thickness which was found to be about 10 nm (at a volume fraction of ~39%) for a Langmuir-Blodgett film of an average platelet lateral size of 170 ± 40 nm. The electronic behaviour of the material shows more similarities with polycrystalline turbostratic graphite than thin films of reduced graphene oxide, carbon nanotubes, or disordered conducting polymers. While in these systems the conduction mechanism is often dominated by the presence of an energy barrier between conductive and non-conductive regions in the network, in the exfoliated graphene networks the conduction mechanism can be explained by the simple two-band model which is characteristic of polycrystalline graphite.
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Affiliation(s)
- HoKwon Kim
- CASC, Department of Materials, Imperial College London, Prince Consort Road, London, SW7 2AZ, UK. ;
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20
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Schrenk KJ, Posé N, Kranz JJ, van Kessenich LVM, Araújo NAM, Herrmann HJ. Percolation with long-range correlated disorder. PHYSICAL REVIEW. E, STATISTICAL, NONLINEAR, AND SOFT MATTER PHYSICS 2013; 88:052102. [PMID: 24329209 DOI: 10.1103/physreve.88.052102] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/11/2013] [Indexed: 06/03/2023]
Abstract
Long-range power-law correlated percolation is investigated using Monte Carlo simulations. We obtain several static and dynamic critical exponents as functions of the Hurst exponent H, which characterizes the degree of spatial correlation among the occupation of sites. In particular, we study the fractal dimension of the largest cluster and the scaling behavior of the second moment of the cluster size distribution, as well as the complete and accessible perimeters of the largest cluster. Concerning the inner structure and transport properties of the largest cluster, we analyze its shortest path, backbone, red sites, and conductivity. Finally, bridge site growth is also considered. We propose expressions for the functional dependence of the critical exponents on H.
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Affiliation(s)
- K J Schrenk
- Computational Physics for Engineering Materials, Institute for Building Materials, ETH Zurich, Wolfgang-Pauli-Strasse 27, CH-8093 Zurich, Switzerland
| | - N Posé
- Computational Physics for Engineering Materials, Institute for Building Materials, ETH Zurich, Wolfgang-Pauli-Strasse 27, CH-8093 Zurich, Switzerland
| | - J J Kranz
- Computational Physics for Engineering Materials, Institute for Building Materials, ETH Zurich, Wolfgang-Pauli-Strasse 27, CH-8093 Zurich, Switzerland
| | - L V M van Kessenich
- Computational Physics for Engineering Materials, Institute for Building Materials, ETH Zurich, Wolfgang-Pauli-Strasse 27, CH-8093 Zurich, Switzerland
| | - N A M Araújo
- Computational Physics for Engineering Materials, Institute for Building Materials, ETH Zurich, Wolfgang-Pauli-Strasse 27, CH-8093 Zurich, Switzerland
| | - H J Herrmann
- Computational Physics for Engineering Materials, Institute for Building Materials, ETH Zurich, Wolfgang-Pauli-Strasse 27, CH-8093 Zurich, Switzerland and Departamento de Física, Universidade Federal do Ceará, 60451-970 Fortaleza, Ceará, Brazil
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21
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Lau HW, Grassberger P. Information theoretic aspects of the two-dimensional Ising model. PHYSICAL REVIEW. E, STATISTICAL, NONLINEAR, AND SOFT MATTER PHYSICS 2013; 87:022128. [PMID: 23496480 DOI: 10.1103/physreve.87.022128] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/25/2012] [Indexed: 06/01/2023]
Abstract
We present numerical results for various information theoretic properties of the square lattice Ising model. First, using a bond propagation algorithm, we find the difference 2H(L)(w)-H(2L)(w) between entropies on cylinders of finite lengths L and 2L with open end cap boundaries, in the limit L→∞. This essentially quantifies how the finite length correction for the entropy scales with the cylinder circumference w. Secondly, using the transfer matrix, we obtain precise estimates for the information needed to specify the spin state on a ring encircling an infinitely long cylinder. Combining both results, we obtain the mutual information between the two halves of a cylinder (the "excess entropy" for the cylinder), where we confirm with higher precision but for smaller systems the results recently obtained by Wilms et al., and we show that the mutual information between the two halves of the ring diverges at the critical point logarithmically with w. Finally, we use the second result together with Monte Carlo simulations to show that also the excess entropy of a straight line of n spins in an infinite lattice diverges at criticality logarithmically with n. We conjecture that such logarithmic divergence happens generically for any one-dimensional subset of sites at any two-dimensional second-order phase transition. Comparing straight lines on square and triangular lattices with square loops and with lines of thickness 2, we discuss questions of universality.
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Affiliation(s)
- Hon Wai Lau
- Complexity Science Group, University of Calgary, Calgary, Canada T2N 1N4
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22
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Posé N, Araújo NAM, Herrmann HJ. Conductivity of Coniglio-Klein clusters. PHYSICAL REVIEW. E, STATISTICAL, NONLINEAR, AND SOFT MATTER PHYSICS 2012; 86:051140. [PMID: 23214771 DOI: 10.1103/physreve.86.051140] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/17/2012] [Revised: 09/26/2012] [Indexed: 06/01/2023]
Abstract
We performed numerical simulations of the q-state Potts model to compute the reduced conductivity exponent t/ν for the critical Coniglio-Klein clusters in two dimensions, for values of q in the range [1,4]. At criticality, at least for q<4, the conductivity scales as C(L) ~ L(-t/ν), where t and ν are, respectively, the conductivity and correlation length exponents. For q=1, 2, 3, and 4, we followed two independent procedures to estimate t/ν. First, we computed directly the conductivity at criticality and obtained t/ν from the size dependence. Second, using the relation between conductivity and transport properties, we obtained t/ν from the diffusion of a random walk on the backbone of the cluster. From both methods, we estimated t/ν to be 0.986 ± 0.012, 0.877 ± 0.014, 0.785 ± 0.015, and 0.658 ± 0.030, for q=1, 2, 3, and 4, respectively. We also evaluated t/ν for noninteger values of q and propose the conjecture 40 gt/ν = 72 + 20 g - 3g(2) for the dependence of the reduced conductivity exponent on q, in the range 0 ≤ q ≤ 4, where g is the Coulomb gas coupling.
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Affiliation(s)
- Nicolas Posé
- Computational Physics for Engineering Materials, IfB, ETH Zurich, Schafmattstrasse 6, CH-8093 Zurich, Switzerland.
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23
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Harris JM, Iyer GRS, Bernhardt AK, Huh JY, Hudson SD, Fagan JA, Hobbie EK. Electronic durability of flexible transparent films from type-specific single-wall carbon nanotubes. ACS NANO 2012; 6:881-887. [PMID: 22148890 DOI: 10.1021/nn204383t] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/31/2023]
Abstract
The coupling between mechanical flexibility and electronic performance is evaluated for thin films of metallic and semiconducting single-wall carbon nanotubes (SWCNTs) deposited on compliant supports. Percolated networks of type-purified SWCNTs are assembled as thin conducting coatings on elastic polymer substrates, and the sheet resistance is measured as a function of compression and cyclic strain through impedance spectroscopy. The wrinkling topography, microstructure and transparency of the films are independently characterized using optical microscopy, electron microscopy, and optical absorption spectroscopy. Thin films made from metallic SWCNTs show better durability as flexible transparent conductive coatings, which we attribute to a combination of superior mechanical performance and higher interfacial conductivity.
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Affiliation(s)
- John M Harris
- Department of Physics, Department of Coatings and Polymeric Materials, North Dakota State University, Fargo, North Dakota 58108, USA
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24
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Jeong C, Nair P, Khan M, Lundstrom M, Alam MA. Prospects for nanowire-doped polycrystalline graphene films for ultratransparent, highly conductive electrodes. NANO LETTERS 2011; 11:5020-5. [PMID: 21985666 DOI: 10.1021/nl203041n] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/02/2023]
Abstract
Traditional transparent conducting materials such as ITO are expensive, brittle, and inflexible. Although alternatives like networks of carbon nanotubes, polycrystalline graphene, and metallic nanowires have been proposed, the transparency-conductivity trade-off of these materials makes them inappropriate for broad range of applications. In this paper, we show that the conductivity of polycrystalline graphene is limited by high resistance grain boundaries. We demonstrate that a composite based on polycrystalline graphene and a subpercolating network of metallic nanowires offers a simple and effective route to reduced resistance while maintaining high transmittance. This new approach of "percolation-doping by nanowires" has the potential to beat the transparency-conductivity constraints of existing materials and may be suitable for broad applications in photovoltaics, flexible electronics, and displays.
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Affiliation(s)
- Changwook Jeong
- Network for Computational Nanotechnology, Birck Nanotechnology Center, Purdue University, West Lafayette, Indiana 47907, United States.
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25
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Kim S, Kim S, Park J, Ju S, Mohammadi S. Fully transparent pixel circuits driven by random network carbon nanotube transistor circuitry. ACS NANO 2010; 4:2994-2998. [PMID: 20450163 DOI: 10.1021/nn1006094] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/29/2023]
Abstract
Optically transparent and mechanically flexible thin-film transistors have recently attracted attention for next generation transparent display technologies. Driving and switching transistors for transparent displays have challenging requirements such as high optical transparency, large-scale integration, suitable drive current (I(on)) in the microampere range, high on/off current ratio (I(on)/I(off)), high field-effect mobility, and uniform threshold voltage (V(th)). In this study, we demonstrate fully transparent high-performance and high-yield thin-film transistors based on random growth of a single-walled carbon nanotube (SWNT) network that are easy to fabricate. High-performance SWNT-TFTs exhibit optical transmission of 80% in visible wavelength, I(on)/I(off) higher than 10(3), and a high yield with reproducible electrical characteristics.
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Affiliation(s)
- Sunkook Kim
- School of Electrical and Computer Engineering and Birck Nanotechnology Center, Purdue University, West Lafayette, Indiana 47907, USA
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26
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The elastic modulus, percolation, and disaggregation of strongly interacting, intersecting antiplane cracks. Proc Natl Acad Sci U S A 2009; 106:12634-9. [PMID: 19443684 DOI: 10.1073/pnas.0903014106] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
Abstract
We study the modulus of a medium containing a varying density of nonintersecting and intersecting antiplane cracks. The modulus of nonintersecting, strongly interacting, 2D antiplane cracks obeys a mean-field theory for which the mean field on a crack inserted in a random ensemble is the applied stress. The result of a self-consistent calculation in the nonintersecting case predicts zero modulus at finite packing, which is physically impossible. Differential self-consistent theories avoid the zero modulus problem, but give results that are more compliant than those of both mean-field theory and computer simulations. For problems in which antiplane cracks are allowed to intersect and form crack clusters or larger effective cracks, percolation at finite packing is expected when the shear modulus vanishes. At low packing factor, the modulus follows the dilute, mean-field curve, but with increased packing, mutual interactions cause the modulus to be less than the mean-field result and to vanish at the percolation threshold. The "nodes-links-blobs" model predicts a power-law approach to the percolation threshold at a critical packing factor of p(c) = 4.426. We conclude that a power-law variation of modulus with packing, with exponent 1.3 drawn tangentially to the mean-field nonintersecting relation and passing through the percolation threshold, can be expected to be a good approximation. The approximation is shown to be consistent with simulations of intersecting rectangular cracks at all packing densities through to the percolation value for this geometry, p(c) = 0.4072.
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27
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28
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Hamou RF, Macdonald JR, Tuncer E. Dispersive dielectric and conductive effects in 2D resistor-capacitor networks. JOURNAL OF PHYSICS. CONDENSED MATTER : AN INSTITUTE OF PHYSICS JOURNAL 2009; 21:025904. [PMID: 21813993 DOI: 10.1088/0953-8984/21/2/025904] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/31/2023]
Abstract
How to predict and better understand the effective properties of disordered material mixtures has been a long-standing problem in different research fields, especially in condensed matter physics. In order to address this subject and achieve a better understanding of the frequency-dependent properties of these systems, a large 2D L × L square structure of resistors and capacitors was used to calculate the immittance response of a network formed by random filling of binary conductor/insulator phases with 1000 Ω resistors and 10 nF capacitors. The effects of percolating clusters on the immittance response were studied statistically through the generation of 10 000 different random network samples at the percolation threshold. The scattering of the imaginary part of the immittance near the dc limit shows a clear separation between the responses of percolating and non-percolating samples, with the gap between their distributions dependent on both network size and applied frequency. These results could be used to monitor connectivity in composite materials. The effects of the content and structure of the percolating path on the nature of the observed dispersion were investigated, with special attention paid to the geometrical fractal concept of the backbone and its influence on the behavior of relaxation-time distributions. For three different resistor-capacitor proportions, the appropriateness of many fitting models was investigated for modeling and analyzing individual resistor-capacitor network dispersed frequency responses using complex-nonlinear-least-squares fitting. Several remarkable new features were identified, including a useful duality relationship and the need for composite fitting models rather than either a simple power law or a single Davidson-Cole one. Good fits of data for fully percolating random networks required two dispersive fitting models in parallel or series, with a cutoff at short times of the distribution of relaxation times of one of them. In addition, such fits surprisingly led to cutoff parameters, including a primitive relaxation or crossover time, with estimated values comparable to those found for real dispersive materials.
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Affiliation(s)
- R F Hamou
- Max-Planck-Institut für Eisenforschung GmbH, Max-Planck-Straße 1, 40237 Düsseldorf, Germany
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29
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Simien D, Fagan JA, Luo W, Douglas JF, Migler K, Obrzut J. Influence of nanotube length on the optical and conductivity properties of thin single-wall carbon nanotube networks. ACS NANO 2008; 2:1879-1884. [PMID: 19206428 DOI: 10.1021/nn800376x] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/27/2023]
Abstract
We study the optical and electrical properties of transparent conducting films made from length-sorted single-wall carbon nanotubes (SWCNT). Thin films of length-sorted SWCNTs, formed through filtration from a dispersing solvent onto a filter substrate ("buckypaper"), exhibit sharp changes in their optical properties and conductivity (sigma) with increasing SWCNT surface concentration. At a given surface concentration, tubes longer than 200 nm are found to form networks that are more transparent and conducting. We show that changes of sigma with SWCNT concentration can be quantitatively described by the generalized effective medium (GEM) theory. The scaling universal exponents describing the "percolation" transition from an insulating to a conducting state with increasing concentration are consistent with the two-dimensional (2D) percolation model. Shorter tubes and mixed length tubes form 3D networks. Furthermore, we demonstrate that the conductivity percolation threshold (x(c)) varies with the aspect ratio L as, x(c) approximately 1/L, a result that is also in accordance with the percolation theory. These findings provide a framework for engineering the optical and electrical properties of SWCNT networks for technological applications where flexibility, transparency, and conductivity are required.
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Affiliation(s)
- Daneesh Simien
- Polymers Division, National Institute of Standards and Technology, Gaithersburg, Maryland 20899, USA
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Papanikolaou S, Fernandes RM, Fradkin E, Phillips PW, Schmalian J, Sknepnek R. Universality of liquid-gas Mott transitions at finite temperatures. PHYSICAL REVIEW LETTERS 2008; 100:026408. [PMID: 18232898 DOI: 10.1103/physrevlett.100.026408] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/07/2007] [Indexed: 05/25/2023]
Abstract
We explain, in a consistent manner, the set of seemingly conflicting experiments on the finite temperature Mott critical point, and demonstrate that the Mott transition is in the Ising universality class. We show that, even though the thermodynamic behavior of the system near such critical point is described by an Ising order parameter, the global conductivity can depend on other singular observables and, in particular, on the energy density. Finally, we show that in the presence of weak disorder the dimensionality of the system has crucial effects on the size of the critical region that is probed experimentally.
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Affiliation(s)
- Stefanos Papanikolaou
- Department of Physics, University of Illinois at Urbana-Champaign, 1110 W. Green St., Urbana, Illinois 61801-3080, USA
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31
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Siekierski M, Wieczorek W, Nadara K. Mesoscale models of conductivity in polymeric electrolytes—A comparative study. Electrochim Acta 2007. [DOI: 10.1016/j.electacta.2007.04.033] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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32
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McCullen SD, Stevens DR, Roberts WA, Ojha SS, Clarke LI, Gorga RE. Morphological, Electrical, and Mechanical Characterization of Electrospun Nanofiber Mats Containing Multiwalled Carbon Nanotubes. Macromolecules 2007. [DOI: 10.1021/ma061735c] [Citation(s) in RCA: 130] [Impact Index Per Article: 7.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Seth D. McCullen
- Fiber and Polymer Science Program, Department of Textile Engineering, Chemistry and Science, North Carolina State University; Joint Department of Biomedical Engineering, University of North Carolina at Chapel Hill and North Carolina State University; and Department of Physics, North Carolina State University, Raleigh, North Carolina 27695
| | - Derrick R. Stevens
- Fiber and Polymer Science Program, Department of Textile Engineering, Chemistry and Science, North Carolina State University; Joint Department of Biomedical Engineering, University of North Carolina at Chapel Hill and North Carolina State University; and Department of Physics, North Carolina State University, Raleigh, North Carolina 27695
| | - Wesley A. Roberts
- Fiber and Polymer Science Program, Department of Textile Engineering, Chemistry and Science, North Carolina State University; Joint Department of Biomedical Engineering, University of North Carolina at Chapel Hill and North Carolina State University; and Department of Physics, North Carolina State University, Raleigh, North Carolina 27695
| | - Satyajeet S. Ojha
- Fiber and Polymer Science Program, Department of Textile Engineering, Chemistry and Science, North Carolina State University; Joint Department of Biomedical Engineering, University of North Carolina at Chapel Hill and North Carolina State University; and Department of Physics, North Carolina State University, Raleigh, North Carolina 27695
| | - Laura I. Clarke
- Fiber and Polymer Science Program, Department of Textile Engineering, Chemistry and Science, North Carolina State University; Joint Department of Biomedical Engineering, University of North Carolina at Chapel Hill and North Carolina State University; and Department of Physics, North Carolina State University, Raleigh, North Carolina 27695
| | - Russell E. Gorga
- Fiber and Polymer Science Program, Department of Textile Engineering, Chemistry and Science, North Carolina State University; Joint Department of Biomedical Engineering, University of North Carolina at Chapel Hill and North Carolina State University; and Department of Physics, North Carolina State University, Raleigh, North Carolina 27695
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33
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Loh YL, Carlson EW. Efficient algorithm for random-bond ising models in 2D. PHYSICAL REVIEW LETTERS 2006; 97:227205. [PMID: 17155838 DOI: 10.1103/physrevlett.97.227205] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/28/2006] [Indexed: 05/12/2023]
Abstract
We present an efficient algorithm for calculating the properties of Ising models in two dimensions, directly in the spin basis, without the need for mapping to fermion or dimer models. The algorithm computes the partition function and correlation functions at a single temperature on any planar network of N Ising spins in O(N;{3/2}) time or less. The method can handle continuous or discrete bond disorder and is especially efficient in the case of bond or site dilution, where it executes in O(NlnN) time near the percolation threshold. We demonstrate its feasibility on the ferromagnetic Ising model and the +/-J random-bond Ising model and discuss the regime of applicability in cases of full frustration such as the Ising antiferromagnet on a triangular lattice.
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Affiliation(s)
- Y L Loh
- Department of Physics, Purdue University, West Lafayette, Indiana 47907, USA
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Carlson EW, Dahmen KA, Fradkin E, Kivelson SA. Hysteresis and noise from electronic nematicity in high-temperature superconductors. PHYSICAL REVIEW LETTERS 2006; 96:097003. [PMID: 16606299 DOI: 10.1103/physrevlett.96.097003] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/11/2005] [Indexed: 05/08/2023]
Abstract
An electron nematic is a translationally invariant state which spontaneously breaks the discrete rotational symmetry of a host crystal. In a clean square lattice, the electron nematic has two preferred orientations, while dopant disorder favors one or the other orientations locally. In this way, the electron nematic in a host crystal maps to the random field Ising model. Since the electron nematic has anisotropic conductivity, we associate each Ising configuration with a resistor network and use what is known about the random field Ising model to predict new ways to test for local electronic nematic order (nematicity) using noise and hysteresis. In particular, we have uncovered a remarkably robust linear relation between the orientational order and the resistance anisotropy which holds over a wide range of circumstances.
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Affiliation(s)
- E W Carlson
- Department of Physics, Purdue University, West Lafayette, Indiana 47907, USA
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35
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Lebovka NI, Tarafdar S, Vygornitskii NV. Computer simulation of electrical conductivity of colloidal dispersions during aggregation. PHYSICAL REVIEW. E, STATISTICAL, NONLINEAR, AND SOFT MATTER PHYSICS 2006; 73:031402. [PMID: 16605519 DOI: 10.1103/physreve.73.031402] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/01/2005] [Revised: 12/15/2005] [Indexed: 05/08/2023]
Abstract
The computation approach to the simulation of electrical conductivity of colloidal dispersions during aggregation is considered. We use the two-dimensional diffusion-limited aggregation model with multiple-seed growth. The particles execute a random walk, but lose their mobility after contact with the growing clusters or seeds. The two parameters that control the aggregation are the initial concentration of free particles in the system p and the concentration of seeds psi. The case of psi=1, when all the particles are the immobile seeds, corresponds with the usual random percolation problem. The other limiting case of psi=0, when all the particles walk randomly, corresponds to the dynamical percolation problem. The calculation of electrical conductivity and cluster analysis were done with the help of the algorithms of Frank-Lobb and Hoshen-Kopelman. It is shown that the percolation concentration phi c decreases from 0.5927 at psi=1 to 0 at psi --> 0. Scaling analysis was applied to study exponents of correlation length v and of conductivity t. For all psi>0 this model shows universal behavior of classical 2d random percolation with v approximately t approximately 4/3. The electrical conductivity sigma of the system increases during aggregation reaching up to a maximum at the final stage. The concentration dependence of conductivity sigma(phi) obeys the general effective medium equation with apparent exponent ta(psi) that exceeds t. The kinetics of electrical conductivity changes during the aggregation is discussed. In the range of concentration Pc(phi)<p<0.9527 the time of percolation cluster formation pi c decreases with increasing phi.
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Affiliation(s)
- N I Lebovka
- F. D. Ovcharenko Biocolloid Chemistry Institute, 42 Vernadsky Av., Kyiv, Ukraine
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36
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Kumar S, Murthy JY, Alam MA. Percolating conduction in finite nanotube networks. PHYSICAL REVIEW LETTERS 2005; 95:066802. [PMID: 16090972 DOI: 10.1103/physrevlett.95.066802] [Citation(s) in RCA: 66] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/08/2005] [Indexed: 05/03/2023]
Abstract
The percolating conductance of a new class of nanocomposite thin-film transistors, with channels composed of isotropic ensembles of nanotubes or nanowires, is analyzed as a function of wire/tube density and channel length. The conductance exponents are validated against analytical results for short channel transistors, and against available experimental data for longer channel devices. Our plots of conductance exponents as a function of tube-to-tube coupling strength provide a unified framework to interpret future experiments and should help design better nanocomposite transistors.
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Affiliation(s)
- S Kumar
- Department of Mechanical Engineering, Purdue University, West Lafayette, Indiana 47907-2088, USA
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37
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Chubynsky MV, Thorpe MF. Mean-field conductivity in a certain class of networks. PHYSICAL REVIEW. E, STATISTICAL, NONLINEAR, AND SOFT MATTER PHYSICS 2005; 71:056105. [PMID: 16089600 DOI: 10.1103/physreve.71.056105] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/15/2004] [Revised: 03/07/2005] [Indexed: 05/03/2023]
Abstract
We consider resistor networks, which are lattices with bonds represented by conductors and some of the bonds removed. It is known that effective medium theories predict that the effective conductivity of such networks is a linear function of the number of bonds present above the percolation threshold, but exact results for completely random networks deviate from linearity. We show that if instead we take a randomly chosen tree spanning the lattice and then start adding bonds to it at random, the conductivity changes linearly with the number of added bonds and coincides with the effective medium result for a given bond concentration. We also make comparisons with some related models.
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Affiliation(s)
- M V Chubynsky
- Département de Physique, Université de Montréal, Case Postale 6128, Succursale Centre-ville, Montréal, Québec, Canada H3C 3J7.
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38
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Computer simulation of conduction in heterogeneous materials: application of wavelet transformations. Chem Eng Sci 2004. [DOI: 10.1016/j.ces.2004.06.019] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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39
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Zekri L, Zekri N, Clerc JP. Novel computational method for accurate determination of the effective conductivity and the local field of multicomponent 3D composites. ACTA ACUST UNITED AC 2004. [DOI: 10.1088/0305-4470/37/21/013] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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40
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Genov DA, Sarychev AK, Shalaev VM. Plasmon localization and local field distribution in metal-dielectric films. PHYSICAL REVIEW. E, STATISTICAL, NONLINEAR, AND SOFT MATTER PHYSICS 2003; 67:056611. [PMID: 12786300 DOI: 10.1103/physreve.67.056611] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/12/2002] [Indexed: 05/24/2023]
Abstract
An exact and very efficient numerical method for calculating the effective conductivity and local-field distributions in random R-L-C networks is developed. Using this method, the local-field properties of random metal-dielectric films are investigated in a wide spectral range and for a variety of metal concentrations p. It is shown that for metal concentrations close to the percolation threshold (p=p(c)) and frequencies close to the resonance, the local-field intensity is characterized by a non-Gaussian, exponentially broad distribution. For low and high metal concentrations a scaling region is formed that is due to the increasing number of noninteracting dipoles. The local electric fields are studied in terms of characteristic length parameters. The roles of both localized and extended eigenmodes in Kirchhoff's Hamiltonian are investigated.
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Affiliation(s)
- Dentcho A Genov
- School of Electrical and Computer Engineering, Purdue University, West Lafayette, IN 47907-1285, USA
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41
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Burgy J, Mayr M, Martin-Mayor V, Moreo A, Dagotto E. Colossal effects in transition metal oxides caused by intrinsic inhomogeneities. PHYSICAL REVIEW LETTERS 2001; 87:277202. [PMID: 11800911 DOI: 10.1103/physrevlett.87.277202] [Citation(s) in RCA: 83] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/20/2001] [Indexed: 05/23/2023]
Abstract
The influence of quenched disorder on the competition between ordered states separated by a first-order transition is investigated. A phase diagram with features resembling quantum-critical behavior is observed, even using classical models. The low-temperature paramagnetic regime consists of coexisting ordered clusters, with randomly oriented order parameters. Extended to manganites, this state is argued to have a colossal magnetoresistance effect. A scale T(*) for cluster formation is discussed. This is the analog of the Griffiths temperature, but for the case of two competing orders, producing a strong susceptibility to external fields. Cuprates may have similar features, compatible with the large proximity effect of the very underdoped regime.
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Affiliation(s)
- J Burgy
- National High Magnetic Field Lab, Florida State University, Tallahassee, Florida 32306, USA
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42
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Pulsed electric field breakage of cellular tissues: visualisation of percolative properties. INNOV FOOD SCI EMERG 2001. [DOI: 10.1016/s1466-8564(01)00024-8] [Citation(s) in RCA: 121] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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43
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Pennetta C, Trefan G, Reggiani L. Scaling law of resistance fluctuations in stationary random resistor networks. PHYSICAL REVIEW LETTERS 2000; 85:5238-5241. [PMID: 11102230 DOI: 10.1103/physrevlett.85.5238] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/24/2000] [Indexed: 05/23/2023]
Abstract
In a random resistor network we consider the simultaneous evolution of two competing random processes consisting in breaking and recovering the elementary resistors with probabilities W(D) and W(R). The condition W(R)>W(D)/(1+W(D)) leads to a stationary state, while in the opposite case, the broken resistor fraction reaches the percolation threshold p(c). We study the resistance noise of this system under stationary conditions by Monte Carlo simulations. The variance of resistance fluctuations <deltaR2> is found to follow a scaling law |p-p(c)|(-kappa(0)) with kappa(0) = 5.5. The proposed model relates quantitatively the defectiveness of a disordered media with its electrical and excess-noise characteristics.
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Affiliation(s)
- C Pennetta
- Dipartimento di Ingegneria dell'Innovazione e Istituto Nazionale di Fisica della Materia, Universita di Lecce, Via Arnesano, I-73100 Lecce, Italy
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44
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Liu DJ, Evans JW. Surface diffusion in mixed overlayers with superlattice ordering: Percolative transport around obstacles and along domain boundaries. J Chem Phys 2000. [DOI: 10.1063/1.1322356] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
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45
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Vocka R, Dubois MA. Pore network as a model of porous media: comparison between nonhierarchical and hierarchical organizations of pores. PHYSICAL REVIEW. E, STATISTICAL PHYSICS, PLASMAS, FLUIDS, AND RELATED INTERDISCIPLINARY TOPICS 2000; 62:5216-5224. [PMID: 11089083 DOI: 10.1103/physreve.62.5216] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/16/1998] [Revised: 06/02/2000] [Indexed: 05/23/2023]
Abstract
A pore network is used as a model of a porous medium with hierarchical and single level organization of the pores. A microscopic diffusion or adsorption process is introduced that permits the study of both temporal evolution and effective properties of transport. The relationships between the model parameters and the measurable quantities are derived. The transport in media with a hierarchical organization of pores is shown to be qualitatively different from that in media lacking this organization. The question of experimental distinction between the two types of pore organization is also studied. We show that mercury intrusion porosimetry (MIP) measurements furnish valuable information about the pore organization in a sample, but that the exact deconvolution of the real pore size distribution from the experimental data is not straightforward. Our work provides indications for a correct interpretation of MIP results. Qualitative comparison with experiments show the pertinence of hierarchical models.
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Affiliation(s)
- R Vocka
- Service de Physique de l'Etat Condense, SPEC/DRECAM, CEN Saclay, F-91191 Gif-sur-Yvette, France
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46
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Zekri L, Bouamrane R, Zekri N. New method for the exact determination of the effective conductivity and the local field in RLC networks. ACTA ACUST UNITED AC 2000. [DOI: 10.1088/0305-4470/33/3/315] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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47
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Vocka R. Transport on an annealed disordered lattice. PHYSICAL REVIEW. E, STATISTICAL PHYSICS, PLASMAS, FLUIDS, AND RELATED INTERDISCIPLINARY TOPICS 1999; 60:3516-9. [PMID: 11970186 DOI: 10.1103/physreve.60.3516] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/28/1999] [Indexed: 04/18/2023]
Abstract
We study the diffusion on an annealed disordered lattice with a local dynamical reorganization of bonds. We show that the typical rearrangement time depends on the renewal rate like tr approximately tau(alpha) with alpha not equal 1. This implies that the crossover time to normal diffusion in a slow rearrangement regime shows a critical behavior at the percolation threshold. Additional scaling relations for the dependence of the diffusion coefficient on the renewal rate are obtained. The derivation of scaling exponents confirms the crucial role of singly connected bonds in transport properties. These results are checked by numerical simulations in two and three dimensions.
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Affiliation(s)
- R Vocka
- Service de Physique de l'Etat Condensé, SPEC/DRECAM, CEN Saclay, F-91191 Gif-sur-Yvette, France.
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Kovácik J, Bielek J. Random walk in the Cu/graphite mixtures. PHYSICAL REVIEW. B, CONDENSED MATTER 1996; 54:4000-4005. [PMID: 9986300 DOI: 10.1103/physrevb.54.4000] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
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50
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Snarskii AA, Morozovsky AE, Kolek A, Kusy A. 1/f noise in percolation and percolationlike systems. PHYSICAL REVIEW. E, STATISTICAL PHYSICS, PLASMAS, FLUIDS, AND RELATED INTERDISCIPLINARY TOPICS 1996; 53:5596-5605. [PMID: 9964917 DOI: 10.1103/physreve.53.5596] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/22/2023]
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