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Wang Y, Zhao W, Ma Z, Li L, Ma L, Tian G. Theoretical study on the vibrational structures in the conductance spectra of a weakly coupled polycyclic aromatic hydrocarbon molecule. Chem Phys Lett 2023. [DOI: 10.1016/j.cplett.2022.140272] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
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2
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Bian X, Chen Z, Sowa JK, Evangeli C, Limburg B, Swett JL, Baugh J, Briggs GAD, Anderson HL, Mol JA, Thomas JO. Charge-State Dependent Vibrational Relaxation in a Single-Molecule Junction. PHYSICAL REVIEW LETTERS 2022; 129:207702. [PMID: 36462006 DOI: 10.1103/physrevlett.129.207702] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/15/2022] [Accepted: 10/20/2022] [Indexed: 06/17/2023]
Abstract
The outcome of an electron-transfer process is determined by the quantum-mechanical interplay between electronic and vibrational degrees of freedom. Nonequilibrium vibrational dynamics are known to direct electron-transfer mechanisms in molecular systems; however, the structural features of a molecule that lead to certain modes being pushed out of equilibrium are not well understood. Herein, we report on electron transport through a porphyrin dimer molecule, weakly coupled to graphene electrodes, that displays sequential tunneling within the Coulomb-blockade regime. The sequential transport is initiated by current-induced phonon absorption and proceeds by rapid sequential transport via a nonequilibrium vibrational distribution of low-energy modes, likely related to torsional molecular motions. We demonstrate that this is an experimental signature of slow vibrational dissipation, and obtain a lower bound for the vibrational relaxation time of 8 ns, a value dependent on the molecular charge state.
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Affiliation(s)
- Xinya Bian
- Department of Materials, University of Oxford, Oxford OX1 3PH, United Kingdom
| | - Zhixin Chen
- Department of Materials, University of Oxford, Oxford OX1 3PH, United Kingdom
| | - Jakub K Sowa
- Department of Chemistry, Rice University, Houston, Texas 77005, USA
| | | | - Bart Limburg
- Department of Chemistry, University of Oxford, Oxford OX1 3TA, United Kingdom
| | - Jacob L Swett
- Department of Materials, University of Oxford, Oxford OX1 3PH, United Kingdom
| | - Jonathan Baugh
- Institute for Quantum Computing, University of Waterloo, Waterloo, Ontario N2L 3G1, Canada
| | - G Andrew D Briggs
- Department of Materials, University of Oxford, Oxford OX1 3PH, United Kingdom
| | - Harry L Anderson
- Department of Chemistry, University of Oxford, Oxford OX1 3TA, United Kingdom
| | - Jan A Mol
- School of Physical and Chemical Sciences, Queen Mary University, London E1 4NS, United Kingdom
| | - James O Thomas
- Department of Materials, University of Oxford, Oxford OX1 3PH, United Kingdom
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3
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Thomas JO, Sowa JK, Limburg B, Bian X, Evangeli C, Swett JL, Tewari S, Baugh J, Schatz GC, Briggs GAD, Anderson HL, Mol JA. Charge transport through extended molecular wires with strongly correlated electrons. Chem Sci 2021; 12:11121-11129. [PMID: 34522309 PMCID: PMC8386642 DOI: 10.1039/d1sc03050g] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/06/2021] [Accepted: 07/19/2021] [Indexed: 11/21/2022] Open
Abstract
Electron–electron interactions are at the heart of chemistry and understanding how to control them is crucial for the development of molecular-scale electronic devices. Here, we investigate single-electron tunneling through a redox-active edge-fused porphyrin trimer and demonstrate that its transport behavior is well described by the Hubbard dimer model, providing insights into the role of electron–electron interactions in charge transport. In particular, we empirically determine the molecule's on-site and inter-site electron–electron repulsion energies, which are in good agreement with density functional calculations, and establish the molecular electronic structure within various oxidation states. The gate-dependent rectification behavior confirms the selection rules and state degeneracies deduced from the Hubbard model. We demonstrate that current flow through the molecule is governed by a non-trivial set of vibrationally coupled electronic transitions between various many-body ground and excited states, and experimentally confirm the importance of electron–electron interactions in single-molecule devices. Experimental studies of electron transport through an edge-fused porphyrin oligomer in a graphene junction are interpreted within a Hubbard dimer framework.![]()
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Affiliation(s)
- James O Thomas
- Department of Materials, University of Oxford Parks Road Oxford OX1 3PH UK .,Department of Chemistry, University of Oxford, Chemistry Research Laboratory Oxford OX1 3TA UK
| | - Jakub K Sowa
- Department of Chemistry, Northwestern University Evanston Illinois 60208 USA.,Department of Chemistry, Rice University Houston TX USA
| | - Bart Limburg
- Department of Materials, University of Oxford Parks Road Oxford OX1 3PH UK .,Department of Chemistry, University of Oxford, Chemistry Research Laboratory Oxford OX1 3TA UK
| | - Xinya Bian
- Department of Materials, University of Oxford Parks Road Oxford OX1 3PH UK
| | | | - Jacob L Swett
- Department of Materials, University of Oxford Parks Road Oxford OX1 3PH UK
| | - Sumit Tewari
- Department of Materials, University of Oxford Parks Road Oxford OX1 3PH UK
| | - Jonathan Baugh
- Institute for Quantum Computing, University of Waterloo Waterloo ON N2L 3G1 Canada
| | - George C Schatz
- Department of Chemistry, Northwestern University Evanston Illinois 60208 USA
| | - G Andrew D Briggs
- Department of Materials, University of Oxford Parks Road Oxford OX1 3PH UK
| | - Harry L Anderson
- Department of Chemistry, University of Oxford, Chemistry Research Laboratory Oxford OX1 3TA UK
| | - Jan A Mol
- School of Physics and Astronomy, Queen Mary University of London London E1 4NS UK
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4
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Ma J, Cheng Y, Sun M. Plexcitons, electric field gradient and electron-phonon coupling in tip-enhanced Raman spectroscopy (TERS). NANOSCALE 2021; 13:10712-10725. [PMID: 34128524 DOI: 10.1039/d1nr02205a] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/12/2023]
Abstract
Tip-Enhanced Raman Spectroscopy (TERS) provides very high spatial resolution and detection sensitivity, so it has important applications in nano-scale molecular analysis. Plexciton is a polarization mode caused by a strongly coupled interaction between plasma excitons and excitons. It is a hot topic in plasma photonics research. We introduce the characteristics, production methods, observation methods and some applications of TERS. The electric field gradient (EFG) is an important factor affecting TERS resolution. The electron-phonon interaction is a fundamental inelastic interaction and plays an important role in current-carrying single-molecular junctions. This article summarizes the characteristics and applications of these three parts for readers to gain a preliminary understanding.
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Affiliation(s)
- Jialin Ma
- School of Mathematics and Physics, University of Science and Technology Beijing, Beijing 100083, People's Republic of China.
| | - Yuqing Cheng
- School of Mathematics and Physics, University of Science and Technology Beijing, Beijing 100083, People's Republic of China.
| | - Mengtao Sun
- School of Mathematics and Physics, University of Science and Technology Beijing, Beijing 100083, People's Republic of China. and Collaborative Innovation Center of Light Manipulations and Applications, Shandong Normal University, Jinan 250358, P. R. China
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5
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Jahangiri S, Arrazola JM, Delgado A. Quantum Algorithm for Simulating Single-Molecule Electron Transport. J Phys Chem Lett 2021; 12:1256-1261. [PMID: 33497214 DOI: 10.1021/acs.jpclett.0c03724] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/12/2023]
Abstract
An accurate description of electron transport at a molecular level requires a precise treatment of quantum effects. These effects play a crucial role in determining the electron transport properties of single molecules, which can be challenging to simulate classically. Here we introduce a quantum algorithm to efficiently calculate electronic current through single-molecule junctions in the weak-coupling regime. We show that a quantum computer programmed to simulate vibronic transitions between different charge states of a molecule can be used to compute electron-transfer rates and electronic current. In the harmonic approximation, the algorithm can be implemented using Gaussian boson sampling devices, which are a near-term platform for photonic quantum computing. We apply the algorithm to simulate the current and conductance of a magnesium porphine molecule. The algorithm provides a means for better understanding the mechanism of electron transport at a molecular level, which paves the way for building practical molecular electronic devices.
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Pal AK, Bhattacharyya K, Datta A. Polymorphism Dependent 9-Phosphoanthracene Derivative Exhibiting Thermally Activated Delayed Fluorescence: A Computational Investigation. J Phys Chem A 2020; 124:11025-11037. [PMID: 33332131 DOI: 10.1021/acs.jpca.0c10203] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Polymorphs of anthracene derivatives exhibit diverse photophysical properties that can help to develop efficient organic-based photovoltaic devices. 10-Anthryl-9-phosphoanthracene (10-APA) shows different photophysical behaviors for the solid state due to its variety in crystalline arrangement. Herein, we investigate the ground and excited-state properties of the monomer and two different polymorphs of 10-APA from first-principles. Calculations reveal that strong spin-orbit coupling (SOC) between first excited singlet state (S1) and triplet manifolds at their S1-optimized geometries enabling the reverse intersystem crossing (RISC). The electron-vibration coupling (Huang-Rhys factor) in the excited state is the most relevant factor here. For both ISC and RISC, a similarity in Huang-Rhys factors for the molecular vibration along the π···π stacking at low-frequency region makes the rates effective. On the other side, the nonvanishing vibronic relaxation modes provide a relatively slower RISC rate in the red crystal. However, for the red crystal, small reorganization energy (λ) and large Huang-Rhys factor toward S1 → S0 conversion reduce nonradiative decay, leading to a prompt fluorescence. As the feasibility of S1 ↔ T1 conversion increases in the yellow dimer, it allows a delay in fluorescence emission, leading to thermally activated delayed fluorescence (TADF).
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Affiliation(s)
- Arun K Pal
- School of Chemical Sciences, Indian Association for the Cultivation of Science, 2A & 2B Raja S. C. Mullick Road, Jadavpur, Kolkata 700032, WB, India
| | - Kalishankar Bhattacharyya
- School of Chemical Sciences, Indian Association for the Cultivation of Science, 2A & 2B Raja S. C. Mullick Road, Jadavpur, Kolkata 700032, WB, India
| | - Ayan Datta
- School of Chemical Sciences, Indian Association for the Cultivation of Science, 2A & 2B Raja S. C. Mullick Road, Jadavpur, Kolkata 700032, WB, India
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7
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Babetto L, Carlotto S, Carlotto A, Rancan M, Bottaro G, Armelao L, Casarin M. Antenna triplet DFT calculations to drive the design of luminescent Ln 3+ complexes. Dalton Trans 2020; 49:14556-14563. [PMID: 33107521 DOI: 10.1039/d0dt02624g] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Density functional theory-based methods have been exploited to look into the structural, vibrational and electronic properties of antenna ligands, all of them being crucial factors for the reliable design of customized luminescent lanthanide (Ln3+) complexes. The X-ray structures, UV-Vis absorption spectra and triplet (T1) energies of three novel β-diketone ligands with a thienyl group and naphthyl (L1), phenanthryl (L2), and pyrenyl (L3) polycyclic aromatic hydrocarbons as substituents have been modelled. Vibronic progressions provide a strong contribution to the L1 and L2 absorption spectra, while the L3 absorption spectrum needs the assumption of different conformational isomers in solution. T1 energies have been estimated either through the vertical- or the adiabatic-transition approach. The comparison with the phosphorescence spectra of Gd3+ complexes allowed us to infer that the latter approach is the most suitable one, in particular when sizable ligands are involved. Results obtained for the isolated antennas can be directly compared with those of the corresponding Ln3+ complexes, due to the unanimously accepted assumption that the excitation is ligand-centred.
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Affiliation(s)
- Luca Babetto
- Dipartimento di Scienze Chimiche, Università degli Studi di Padova, Via F. Marzolo 1, 35131 Padova, Italy.
| | - Silvia Carlotto
- Dipartimento di Scienze Chimiche, Università degli Studi di Padova, Via F. Marzolo 1, 35131 Padova, Italy. and Institute of Condensed Matter Chemistry and Technologies for Energy (ICMATE), National Research Council (CNR), c/o Department of Chemistry, University of Padova, via F. Marzolo 1, 35131 Padova, Italy
| | - Alice Carlotto
- Dipartimento di Scienze Chimiche, Università degli Studi di Padova, Via F. Marzolo 1, 35131 Padova, Italy.
| | - Marzio Rancan
- Institute of Condensed Matter Chemistry and Technologies for Energy (ICMATE), National Research Council (CNR), c/o Department of Chemistry, University of Padova, via F. Marzolo 1, 35131 Padova, Italy
| | - Gregorio Bottaro
- Institute of Condensed Matter Chemistry and Technologies for Energy (ICMATE), National Research Council (CNR), c/o Department of Chemistry, University of Padova, via F. Marzolo 1, 35131 Padova, Italy
| | - Lidia Armelao
- Dipartimento di Scienze Chimiche, Università degli Studi di Padova, Via F. Marzolo 1, 35131 Padova, Italy. and Institute of Condensed Matter Chemistry and Technologies for Energy (ICMATE), National Research Council (CNR), c/o Department of Chemistry, University of Padova, via F. Marzolo 1, 35131 Padova, Italy
| | - Maurizio Casarin
- Dipartimento di Scienze Chimiche, Università degli Studi di Padova, Via F. Marzolo 1, 35131 Padova, Italy. and Institute of Condensed Matter Chemistry and Technologies for Energy (ICMATE), National Research Council (CNR), c/o Department of Chemistry, University of Padova, via F. Marzolo 1, 35131 Padova, Italy
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8
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Sowa JK, Lambert N, Seideman T, Gauger EM. Beyond Marcus theory and the Landauer-Büttiker approach in molecular junctions. II. A self-consistent Born approach. J Chem Phys 2020; 152:064103. [PMID: 32061212 DOI: 10.1063/1.5143146] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/10/2023] Open
Abstract
Marcus and Landauer-Büttiker approaches to charge transport through molecular junctions describe two contrasting mechanisms of electronic conduction. In previous work, we have shown how these charge transport theories can be unified in the single-level case by incorporating lifetime broadening into the second-order quantum master equation. Here, we extend our previous treatment by incorporating lifetime broadening in the spirit of the self-consistent Born approximation. By comparing both theories to numerically converged hierarchical-equations-of-motion results, we demonstrate that our novel self-consistent approach rectifies shortcomings of our earlier framework, which are present especially in the case of relatively strong electron-vibrational coupling. We also discuss circumstances under which the theory developed here simplifies to the generalized theory developed in our earlier work. Finally, by considering the high-temperature limit of our new self-consistent treatment, we show how lifetime broadening can also be self-consistently incorporated into Marcus theory. Overall, we demonstrate that the self-consistent approach constitutes a more accurate description of molecular conduction while retaining most of the conceptual simplicity of our earlier framework.
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Affiliation(s)
- Jakub K Sowa
- Department of Chemistry, Northwestern University, Evanston, Illinois 60208, USA
| | - Neill Lambert
- Theoretical Quantum Physics Laboratory, RIKEN Cluster for Pioneering Research, Wako-shi, Saitama 351-0198, Japan
| | - Tamar Seideman
- Department of Chemistry, Northwestern University, Evanston, Illinois 60208, USA
| | - Erik M Gauger
- SUPA, Institute of Photonics and Quantum Sciences, Heriot-Watt University, Edinburgh EH14 4AS, United Kingdom
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9
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Bi H, Palma CA, Gong Y, Stallhofer K, Nuber M, Jing C, Meggendorfer F, Wen S, Yam C, Kienberger R, Elbing M, Mayor M, Iglev H, Barth JV, Reichert J. Electron–Phonon Coupling in Current-Driven Single-Molecule Junctions. J Am Chem Soc 2020; 142:3384-3391. [DOI: 10.1021/jacs.9b07757] [Citation(s) in RCA: 12] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
Affiliation(s)
- Hai Bi
- Physics Department, Technical University of Munich, James-Franck-Str. 1, 85748 Garching, Germany
| | - Carlos-Andres Palma
- Physics Department, Technical University of Munich, James-Franck-Str. 1, 85748 Garching, Germany
- Institute of Physics, Chinese Academy of Sciences, 100190 Beijing, P. R. China
- Department of Physics & IRIS Adlershof, Humboldt-Universität zu Berlin, Newtonstr. 15, 12489 Berlin, Germany
| | - Yuxiang Gong
- Physics Department, Technical University of Munich, James-Franck-Str. 1, 85748 Garching, Germany
| | - Klara Stallhofer
- Physics Department, Technical University of Munich, James-Franck-Str. 1, 85748 Garching, Germany
| | - Matthias Nuber
- Physics Department, Technical University of Munich, James-Franck-Str. 1, 85748 Garching, Germany
| | - Chao Jing
- Physics Department, Technical University of Munich, James-Franck-Str. 1, 85748 Garching, Germany
| | - Felix Meggendorfer
- Physics Department, Technical University of Munich, James-Franck-Str. 1, 85748 Garching, Germany
| | - Shizheng Wen
- Beijing Computational Science Research Center, 100084 Beijing, P. R. China
| | - ChiYung Yam
- Beijing Computational Science Research Center, 100084 Beijing, P. R. China
| | - Reinhard Kienberger
- Physics Department, Technical University of Munich, James-Franck-Str. 1, 85748 Garching, Germany
| | - Mark Elbing
- Department of Applied Natural Sciences, TH Lübeck, Mönkhofer Weg 239, 23562 Lübeck, Germany
| | - Marcel Mayor
- Institute of Nanotechnology, Karlsruhe Institute of Technology, Hermann-von-Helmholtz-Platz 1, 76344 Karlsruhe, Germany
- Department of Chemistry, University of Basel, St Johannsring 19, CH-4056 Basel, Switzerland
| | - Hristo Iglev
- Physics Department, Technical University of Munich, James-Franck-Str. 1, 85748 Garching, Germany
| | - Johannes V. Barth
- Physics Department, Technical University of Munich, James-Franck-Str. 1, 85748 Garching, Germany
| | - Joachim Reichert
- Physics Department, Technical University of Munich, James-Franck-Str. 1, 85748 Garching, Germany
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10
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Mavrommati SA, Skourtis SS. Initial-state preparation effects in time-resolved electron paramagnetic resonance experiments. J Chem Phys 2020; 152:044304. [DOI: 10.1063/1.5127806] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Affiliation(s)
| | - Spiros S. Skourtis
- Department of Physics, University of Cyprus, P.O. Box 20537, Nicosia 1678, Cyprus
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11
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Understanding resonant charge transport through weakly coupled single-molecule junctions. Nat Commun 2019; 10:4628. [PMID: 31604934 PMCID: PMC6789103 DOI: 10.1038/s41467-019-12625-4] [Citation(s) in RCA: 28] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/13/2018] [Accepted: 09/20/2019] [Indexed: 11/24/2022] Open
Abstract
Off-resonant charge transport through molecular junctions has been extensively studied since the advent of single-molecule electronics and is now well understood within the framework of the non-interacting Landauer approach. Conversely, gaining a qualitative and quantitative understanding of the resonant transport regime has proven more elusive. Here, we study resonant charge transport through graphene-based zinc-porphyrin junctions. We experimentally demonstrate an inadequacy of non-interacting Landauer theory as well as the conventional single-mode Franck–Condon model. Instead, we model overall charge transport as a sequence of non-adiabatic electron transfers, with rates depending on both outer and inner-sphere vibrational interactions. We show that the transport properties of our molecular junctions are determined by a combination of electron–electron and electron-vibrational coupling, and are sensitive to interactions with the wider local environment. Furthermore, we assess the importance of nuclear tunnelling and examine the suitability of semi-classical Marcus theory as a description of charge transport in molecular devices. The mechanism of nonadiabatic electron transfer in molecular systems is an important research topic for understanding various chemical reactions. Thomas et al. quantify resonant charge transport through single-molecule junctions as a model system for examining quantum and Marcus theories.
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12
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Chen F, Cohen G, Galperin M. Auxiliary Master Equation for Nonequilibrium Dual-Fermion Approach. PHYSICAL REVIEW LETTERS 2019; 122:186803. [PMID: 31144909 DOI: 10.1103/physrevlett.122.186803] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/24/2018] [Indexed: 06/09/2023]
Abstract
We introduce an auxiliary quantum master equation dual fermion method and argue that it presents a convenient way to describe steady states of correlated impurity models. The scheme yields an expansion around a reference that is much closer to the true nonequilibrium state than that in the original dual fermion formulation. In steady-state situations, the scheme is numerically inexpensive and avoids time propagation. The Anderson impurity model is used to test the approach against numerically exact benchmarks.
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Affiliation(s)
- Feng Chen
- Department of Physics, University of California San Diego, La Jolla, California 92093, USA
| | - Guy Cohen
- The Raymond and Beverley Sackler Center for Computational Molecular and Materials Science, Tel Aviv University, Tel Aviv 69978, Israel
- School of Chemistry, Tel Aviv University, Tel Aviv 69978, Israel
| | - Michael Galperin
- Department of Chemistry and Biochemistry, University of California San Diego, La Jolla, California 92093, USA
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13
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Tian G, Sun D, Zhang Y, Yu X. Franck–Condon Blockade and Aggregation‐Modulated Conductance in Molecular Devices Using Aggregation‐Induced Emission‐Active Molecules. Angew Chem Int Ed Engl 2019. [DOI: 10.1002/ange.201900731] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Affiliation(s)
- Guangjun Tian
- Key Laboratory for Microstructural Material Physics of Hebei ProvinceSchool of ScienceYanshan University Qinhuangdao 066004 P. R. China
| | - Dexian Sun
- Key Laboratory for Microstructural Material Physics of Hebei ProvinceSchool of ScienceYanshan University Qinhuangdao 066004 P. R. China
| | - Yaogang Zhang
- Key Laboratory for Microstructural Material Physics of Hebei ProvinceSchool of ScienceYanshan University Qinhuangdao 066004 P. R. China
- Tianjin Key Laboratory of Molecular Optoelectronic ScienceDepartment of Physics and Department of ChemistrySchool of ScienceTianjin University Tianjin 300072 P. R. China
| | - Xi Yu
- Tianjin Key Laboratory of Molecular Optoelectronic ScienceDepartment of Physics and Department of ChemistrySchool of ScienceTianjin University Tianjin 300072 P. R. China
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14
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Tian G, Sun D, Zhang Y, Yu X. Franck–Condon Blockade and Aggregation‐Modulated Conductance in Molecular Devices Using Aggregation‐Induced Emission‐Active Molecules. Angew Chem Int Ed Engl 2019; 58:5951-5955. [DOI: 10.1002/anie.201900731] [Citation(s) in RCA: 28] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/18/2019] [Indexed: 11/09/2022]
Affiliation(s)
- Guangjun Tian
- Key Laboratory for Microstructural Material Physics of Hebei ProvinceSchool of ScienceYanshan University Qinhuangdao 066004 P. R. China
| | - Dexian Sun
- Key Laboratory for Microstructural Material Physics of Hebei ProvinceSchool of ScienceYanshan University Qinhuangdao 066004 P. R. China
| | - Yaogang Zhang
- Key Laboratory for Microstructural Material Physics of Hebei ProvinceSchool of ScienceYanshan University Qinhuangdao 066004 P. R. China
- Tianjin Key Laboratory of Molecular Optoelectronic ScienceDepartment of Physics and Department of ChemistrySchool of ScienceTianjin University Tianjin 300072 P. R. China
| | - Xi Yu
- Tianjin Key Laboratory of Molecular Optoelectronic ScienceDepartment of Physics and Department of ChemistrySchool of ScienceTianjin University Tianjin 300072 P. R. China
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15
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Shishkov VY, Andrianov ES, Pukhov AA, Vinogradov AP, Lisyansky AA. Enhancement of the Raman Effect by Infrared Pumping. PHYSICAL REVIEW LETTERS 2019; 122:153905. [PMID: 31050521 DOI: 10.1103/physrevlett.122.153905] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/28/2019] [Indexed: 06/09/2023]
Abstract
We propose a method for increasing Raman scattering from an ensemble of molecules by up to 4 orders of magnitude. Our method requires an additional coherent source of IR radiation with the half-frequency of the Stokes shift. This radiation excites the molecule electronic subsystem that in turn, via Fröhlich coupling, parametrically excites nuclear oscillations at a resonant frequency. This motion is coherent and leads to a boost of the Raman signal in comparison to the spontaneous signal because its intensity is proportional to the squared number of molecules in the illuminated volume.
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Affiliation(s)
- V Yu Shishkov
- Dukhov Research Institute of Automatics (VNIIA), 22 Sushchevskaya, Moskow 127055, Russia and Moscow Institute of Physics and Technology, 9 Institutskiy per., Dolgoprudny 141700, Moscow region, Russia
- Institute for Theoretical and Applied Electromagnetics, 13 Izhorskaya, Moscow 125412, Russia
| | - E S Andrianov
- Dukhov Research Institute of Automatics (VNIIA), 22 Sushchevskaya, Moskow 127055, Russia and Moscow Institute of Physics and Technology, 9 Institutskiy per., Dolgoprudny 141700, Moscow region, Russia
| | - A A Pukhov
- Dukhov Research Institute of Automatics (VNIIA), 22 Sushchevskaya, Moskow 127055, Russia and Moscow Institute of Physics and Technology, 9 Institutskiy per., Dolgoprudny 141700, Moscow region, Russia
- Institute for Theoretical and Applied Electromagnetics, 13 Izhorskaya, Moscow 125412, Russia
| | - A P Vinogradov
- Dukhov Research Institute of Automatics (VNIIA), 22 Sushchevskaya, Moskow 127055, Russia and Moscow Institute of Physics and Technology, 9 Institutskiy per., Dolgoprudny 141700, Moscow region, Russia
- Institute for Theoretical and Applied Electromagnetics, 13 Izhorskaya, Moscow 125412, Russia
| | - A A Lisyansky
- Department of Physics, Queens College of the City University of New York, Flushing, New York 11367, USA and The Graduate Center of the City University of New York, New York, New York 10016, USA
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16
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Sowa JK, Mol JA, Briggs GAD, Gauger EM. Beyond Marcus theory and the Landauer-Büttiker approach in molecular junctions: A unified framework. J Chem Phys 2018; 149:154112. [DOI: 10.1063/1.5049537] [Citation(s) in RCA: 47] [Impact Index Per Article: 7.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/15/2023] Open
Affiliation(s)
- Jakub K. Sowa
- Department of Materials, University of Oxford, Parks Road, OX1 3PH Oxford, United Kingdom
| | - Jan A. Mol
- Department of Materials, University of Oxford, Parks Road, OX1 3PH Oxford, United Kingdom
| | - G. Andrew D. Briggs
- Department of Materials, University of Oxford, Parks Road, OX1 3PH Oxford, United Kingdom
| | - Erik M. Gauger
- SUPA, Institute of Photonics and Quantum Sciences, Heriot-Watt University, Edinburgh EH14 4AS, United Kingdom
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17
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Bevan KH, Roy-Gobeil A, Miyahara Y, Grutter P. Relating Franck-Condon blockade to redox chemistry in the single-particle picture. J Chem Phys 2018; 149:104109. [DOI: 10.1063/1.5043480] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022] Open
Affiliation(s)
- Kirk H. Bevan
- Division of Materials Engineering, Faculty of Engineering, McGill University, Montréal, Québec H3A 0C5, Canada
| | - Antoine Roy-Gobeil
- Department of Physics, McGill University, 3600 Rue University, Montréal, Québec H3A 2T8, Canada
| | - Yoichi Miyahara
- Department of Physics, McGill University, 3600 Rue University, Montréal, Québec H3A 2T8, Canada
| | - Peter Grutter
- Department of Physics, McGill University, 3600 Rue University, Montréal, Québec H3A 2T8, Canada
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18
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Fu B, Mosquera MA, Schatz GC, Ratner MA, Hsu LY. Photoinduced Anomalous Coulomb Blockade and the Role of Triplet States in Electron Transport through an Irradiated Molecular Transistor. NANO LETTERS 2018; 18:5015-5023. [PMID: 29995424 DOI: 10.1021/acs.nanolett.8b01838] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
In this study, we explore photoinduced electron transport through a molecule weakly coupled to two electrodes by combining first-principles quantum chemistry calculations with a Pauli master equation approach that accounts for many-electron states. In the incoherent limit, we demonstrate that energy-level alignment of triplet and charged states plays a crucial role, even when the rate of intersystem crossing is much smaller than the rate of fluorescence. Furthermore, the field intensity dependence and an upper bound to the photoinduced electric current can be analytically derived in our model. Under an optical field, the conductance spectra (charge stability diagrams) exhibit unusual Coulomb diamonds, which are associated with molecular excited states, and their widths can be expressed in terms of energies of the molecular electronic states. This study offers new directions for exploring optoelectronic response in nanoelectronics.
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Affiliation(s)
| | | | | | | | - Liang-Yan Hsu
- Institute of Atomic and Molecular Sciences , Academia Sinica , Taipei 10617 , Taiwan
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19
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Olsen ST, Hansen T, Mikkelsen KV. Predicting transport regime and local electrostatic environment from Coulomb blockade diamond sizes. J Chem Phys 2017; 146:104306. [PMID: 28298124 DOI: 10.1063/1.4978243] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
Electron transport through a molecule is often described in one of the two regimes: the coherent tunnelling regime or the Coulomb blockade regime. The twilight zone of the two regimes still possesses many unsolved questions. A theoretical analysis of the oligophenylenevinylene OPV3 experiments by Bjørnholm and co-workers is performed. The experiments showed how two OPV3 derivatives performed very differently despite the strong similarity of the molecular structure, hence the experimental data showed two different transport mechanisms. The different transport mechanisms of the two OPV3 derivatives are explained from quantum mechanical calculations of the molecular redox energies and from the experimentally accessible window size.
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Affiliation(s)
- Stine T Olsen
- Department of Chemistry, University of Copenhagen, Copenhagen, Denmark
| | - Thorsten Hansen
- Department of Chemistry, University of Copenhagen, Copenhagen, Denmark
| | - Kurt V Mikkelsen
- Department of Chemistry, University of Copenhagen, Copenhagen, Denmark
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20
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Burzurí E, Island JO, Díaz-Torres R, Fursina A, González-Campo A, Roubeau O, Teat SJ, Aliaga-Alcalde N, Ruiz E, van der Zant HSJ. Sequential Electron Transport and Vibrational Excitations in an Organic Molecule Coupled to Few-Layer Graphene Electrodes. ACS NANO 2016; 10:2521-2527. [PMID: 26841282 DOI: 10.1021/acsnano.5b07382] [Citation(s) in RCA: 37] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
Graphene electrodes are promising candidates to improve reproducibility and stability in molecular electronics through new electrode-molecule anchoring strategies. Here we report sequential electron transport in few-layer graphene transistors containing individual curcuminoid-based molecules anchored to the electrodes via π-π orbital bonding. We show the coexistence of inelastic co-tunneling excitations with single-electron transport physics due to an intermediate molecule-electrode coupling; we argue that an intermediate electron-phonon coupling is the origin of these vibrational-assisted excitations. These experimental observations are complemented with density functional theory calculations to model electron transport and the interaction between electrons and vibrational modes of the curcuminoid molecule. We find that the calculated vibrational modes of the molecule are in agreement with the experimentally observed excitations.
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Affiliation(s)
- Enrique Burzurí
- Kavli Institute of Nanoscience, Delft University of Technology , Lorentzweg 1, 2628 CJ Delft, The Netherlands
| | - Joshua O Island
- Kavli Institute of Nanoscience, Delft University of Technology , Lorentzweg 1, 2628 CJ Delft, The Netherlands
| | - Raúl Díaz-Torres
- CSIC-ICMAB (Institut de Ciència dels Materials de Barcelona), Campus de la Universitat Autònoma de Barcelona , 08193 Bellaterra, Spain
| | - Alexandra Fursina
- Kavli Institute of Nanoscience, Delft University of Technology , Lorentzweg 1, 2628 CJ Delft, The Netherlands
| | - Arántzazu González-Campo
- CSIC-ICMAB (Institut de Ciència dels Materials de Barcelona), Campus de la Universitat Autònoma de Barcelona , 08193 Bellaterra, Spain
| | - Olivier Roubeau
- Instituto de Ciencia de Materiales de Aragón (ICMA), CSIC, and Universidad de Zaragoza , Plaza San Francisco s/n, 50009 Zaragoza, Spain
| | - Simon J Teat
- Advanced Light Source, Lawrence Berkeley National Laboratory , Berkeley, California 94720, United States
| | - Núria Aliaga-Alcalde
- CSIC-ICMAB (Institut de Ciència dels Materials de Barcelona), Campus de la Universitat Autònoma de Barcelona , 08193 Bellaterra, Spain
- ICREA (Institució Catalana de Recerca i Estudis Avançats) , Passeig Lluís Companys 23, 08010 Barcelona, Spain
| | | | - Herre S J van der Zant
- Kavli Institute of Nanoscience, Delft University of Technology , Lorentzweg 1, 2628 CJ Delft, The Netherlands
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21
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Tian G, Duan S, Zhang GP, Hu W, Luo Y. The effect of Duschinsky rotation on charge transport properties of molecular junctions in the sequential tunneling regime. Phys Chem Chem Phys 2015; 17:23007-16. [PMID: 26272223 DOI: 10.1039/c5cp02736e] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
We present here a systematic theoretical study on the effect of Duschinsky rotation on charge transport properties of molecular junctions in the sequential tunneling regime. In the simulations we assume that only two electronic charging states each coupled to a two dimensional vibrational potential energy surface (PES) are involved in the transport process. The Duschinsky rotation effect is accounted by varying the rotational angle between the two sets of displaced PESs. Both harmonic potential and anharmonic Morse potential have been considered for the cases of the intermediate to strong electron-vibration couplings. Our calculations show that the inclusion of the Duschinsky rotation effect can significantly change the charge transport properties of a molecular junction. Such an effect makes the otherwise symmetric Coulomb diamond become asymmetric in harmonic potentials. Depending on the angle of the rotation, the low bias current could be significantly suppressed or enhanced. This effect is particularly prominent in the Franck-Condon (FC) blockade regime where the electron-vibration coupling is strong. These changes are caused by the variation of the FC factors which are closely related to the rotational angle between the two sets of PESs involved in the charge transport process. For a molecular junction with Morse potentials, the changes caused by Duschinsky rotation are much more complicated. Both the amplitude and shape of the Coulomb diamond are closely dependent on the rotational angle in the whole range from 0 to 2π. One interesting result is that with a rotation angle of π (and also π/2 for certain cases) symmetric Coulomb diamonds can even be formed from the intrinsically asymmetric Morse potential. These results could be important for the interpretation of experimental observations.
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Affiliation(s)
- Guangjun Tian
- Department of Theoretical Chemistry and Biology, School of Biotechnology, Royal Institute of Technology, SE-106 91 Stockholm, Sweden.
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22
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Abstract
The use of a gate electrode allows us to gain deeper insight into the electronic structure of molecular junctions. It is widely used for spectroscopy of the molecular levels and its excited states, for changing the charge state of the molecule and investigating higher order processes such as co-tunneling and the Kondo effect. Gate electrodes have been implemented in several types of nanoscale devices such as electromigration junctions, mechanically controllable break junctions, and devices with carbon-based electrodes. Here we review the state-of-the-art in the field of single-molecule transitors. We discuss the experimental challenges and describe the advances made for the different approaches.
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Affiliation(s)
- Mickael L Perrin
- Kavli Institute of Nanoscience, Delft University of Technology, Lorentzweg 1, 2628 CJ Delft, The Netherlands.
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23
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Palma CA, Joshi S, Hoh T, Ecija D, Barth JV, Auwärter W. Two-level spatial modulation of vibronic conductance in conjugated oligophenylenes on boron nitride. NANO LETTERS 2015; 15:2242-8. [PMID: 25756645 DOI: 10.1021/nl503956p] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/22/2023]
Abstract
Intramolecular current-induced vibronic excitations are reported in highly ordered monolayers of quaterphenylene dicarbonitriles at an electronically patterned boron nitride on copper platform (BN/Cu(111)). A first level of spatially modulated conductance at the nanometer-scale is induced by the substrate. Moreover, a second level of conductance variations at the molecular level is found. Low temperature scanning tunneling microscopy studies in conjunction with molecular dynamics calculations reveal collective amplification of the molecule's interphenylene torsion angles in the monolayer. Librational modes influencing these torsion angles are identified as initial excitations during vibronic conductance. Density functional theory is used to map phenylene breathing modes and other vibrational excitations that are suggested to be at the origin of the submolecular features during vibronic conductance.
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Affiliation(s)
- Carlos-Andres Palma
- §Physik-Department E20, Technische Universität München, D-85748 Garching, Germany
| | - Sushobhan Joshi
- §Physik-Department E20, Technische Universität München, D-85748 Garching, Germany
| | - Tobias Hoh
- §Physik-Department E20, Technische Universität München, D-85748 Garching, Germany
| | - David Ecija
- §Physik-Department E20, Technische Universität München, D-85748 Garching, Germany
- †IMDEA Nanoscience, 28049 Madrid, Spain
| | - Johannes V Barth
- §Physik-Department E20, Technische Universität München, D-85748 Garching, Germany
| | - Willi Auwärter
- §Physik-Department E20, Technische Universität München, D-85748 Garching, Germany
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24
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Antoniou P, Ma Z, Zhang P, Beratan DN, Skourtis SS. Vibrational control of electron-transfer reactions: a feasibility study for the fast coherent transfer regime. Phys Chem Chem Phys 2015; 17:30854-66. [DOI: 10.1039/c5cp00610d] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/10/2023]
Abstract
Electron donors are connectedvialeft and right bridges to electron acceptors. Following electron-transfer initiation, the IR excitation of selected bridge vibrational modes can tune the directionality of electron transfer.
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Affiliation(s)
- P. Antoniou
- Department of Physics
- University of Cyprus
- Nicosia 1678
- Cyprus
| | - Z. Ma
- Department of Chemistry
- Duke University
- Durham
- 27708 USA
| | - P. Zhang
- Department of Chemistry
- Duke University
- Durham
- 27708 USA
| | - D. N. Beratan
- Department of Chemistry
- Duke University
- Durham
- 27708 USA
- Department of Physics
| | - S. S. Skourtis
- Department of Physics
- University of Cyprus
- Nicosia 1678
- Cyprus
- Freiburg institute of Advanced Studies (FRIAS)
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25
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Burzurí E, Yamamoto Y, Warnock M, Zhong X, Park K, Cornia A, van der Zant HSJ. Franck-Condon blockade in a single-molecule transistor. NANO LETTERS 2014; 14:3191-3196. [PMID: 24801879 DOI: 10.1021/nl500524w] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/03/2023]
Abstract
We investigate vibron-assisted electron transport in single-molecule transistors containing an individual Fe4 Single-Molecule Magnet. We observe a strong suppression of the tunneling current at low bias in combination with vibron-assisted excitations. The observed features are explained by a strong electron-vibron coupling in the framework of the Franck-Condon model supported by density-functional theory.
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Affiliation(s)
- Enrique Burzurí
- Kavli Institute of Nanoscience, Delft University of Technology , P.O. Box 5046, 2600 GA Delft, The Netherlands
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26
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Srivastava A, Santhibhushan B, Dobwal P. Performance analysis of impurity added benzene based single-electron transistor. APPLIED NANOSCIENCE 2013. [DOI: 10.1007/s13204-013-0194-0] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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27
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Huh J, Berger R. Coherent state-based generating function approach for Franck–Condon transitions and beyond. ACTA ACUST UNITED AC 2012. [DOI: 10.1088/1742-6596/380/1/012019] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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28
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Jose L, Seth M, Ziegler T. Molecular and Vibrational Structure of Tetroxo d0 Metal Complexes in their Excited States. A Study Based on Time-Dependent Density Functional Calculations and Franck–Condon Theory. J Phys Chem A 2012; 116:1864-76. [DOI: 10.1021/jp212292j] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/28/2023]
Affiliation(s)
- Linta Jose
- Department of Chemistry, University of Calgary, University Drive 2500, Calgary
AB T2N-1N4, Canada
| | - Michael Seth
- Department of Chemistry, University of Calgary, University Drive 2500, Calgary
AB T2N-1N4, Canada
| | - Tom Ziegler
- Department of Chemistry, University of Calgary, University Drive 2500, Calgary
AB T2N-1N4, Canada
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29
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White AJ, Galperin M. Inelastic transport: a pseudoparticle approach. Phys Chem Chem Phys 2012; 14:13809-19. [DOI: 10.1039/c2cp41017f] [Citation(s) in RCA: 35] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/03/2023]
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30
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Tian G, Liu JC, Luo Y. Density-matrix approach for the electroluminescence of molecules in a scanning tunneling microscope. PHYSICAL REVIEW LETTERS 2011; 106:177401. [PMID: 21635061 DOI: 10.1103/physrevlett.106.177401] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/02/2010] [Indexed: 05/30/2023]
Abstract
The electroluminescence (EL) of molecules confined inside a nanocavity in the scanning tunneling microscope possesses many intriguing but unexplained features. We present here a general theoretical approach based on the density-matrix formalism to describe the EL from molecules near a metal surface induced by both electron tunneling and localized surface plasmon excitations simultaneously. It reveals the underlying physical mechanism for the external bias dependent EL. The important role played by the localized surface plasmon on the EL is highlighted. Calculations for porphyrin derivatives have reproduced corresponding experimental spectra and nicely explained the observed unusual large variation of emission spectral profiles. This general theoretical approach can find many applications in the design of molecular electronic and photonic devices.
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Affiliation(s)
- Guangjun Tian
- Hefei National Laboratory for Physical Sciences at the Microscale, University of Science and Technology of China, Hefei, Anhui 230026, People's Republic of China
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31
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Fock J, Sørensen JK, Lörtscher E, Vosch T, Martin CA, Riel H, Kilså K, Bjørnholm T, van der Zant H. A statistical approach to inelastic electron tunneling spectroscopy on fullerene-terminated molecules. Phys Chem Chem Phys 2011; 13:14325-32. [DOI: 10.1039/c1cp20861f] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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32
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Andergassen S, Meden V, Schoeller H, Splettstoesser J, Wegewijs MR. Charge transport through single molecules, quantum dots and quantum wires. NANOTECHNOLOGY 2010; 21:272001. [PMID: 20571187 DOI: 10.1088/0957-4484/21/27/272001] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/29/2023]
Abstract
We review recent progress in the theoretical description of correlation and quantum fluctuation phenomena in charge transport through single molecules, quantum dots and quantum wires. Various physical phenomena are addressed, relating to cotunneling, pair-tunneling, adiabatic quantum pumping, charge and spin fluctuations, and inhomogeneous Luttinger liquids. We review theoretical many-body methods to treat correlation effects, quantum fluctuations, non-equilibrium physics, and the time evolution into the stationary state of complex nanoelectronic systems.
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Affiliation(s)
- S Andergassen
- Institut für Theoretische Physik A, RWTH Aachen, 52056 Aachen, Germany
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33
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Jan van der Molen S, Liljeroth P. Charge transport through molecular switches. JOURNAL OF PHYSICS. CONDENSED MATTER : AN INSTITUTE OF PHYSICS JOURNAL 2010; 22:133001. [PMID: 21389503 DOI: 10.1088/0953-8984/22/13/133001] [Citation(s) in RCA: 134] [Impact Index Per Article: 9.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
Abstract
We review the fascinating research on charge transport through switchable molecules. In the past decade, detailed investigations have been performed on a great variety of molecular switches, including mechanically interlocked switches (rotaxanes and catenanes), redox-active molecules and photochromic switches (e.g. azobenzenes and diarylethenes). To probe these molecules, both individually and in self-assembled monolayers (SAMs), a broad set of methods have been developed. These range from low temperature scanning tunneling microscopy (STM) via two-terminal break junctions to larger scale SAM-based devices. It is generally found that the electronic coupling between molecules and electrodes has a profound influence on the properties of such molecular junctions. For example, an intrinsically switchable molecule may lose its functionality after it is contacted. Vice versa, switchable two-terminal devices may be created using passive molecules ('extrinsic switching'). Developing a detailed understanding of the relation between coupling and switchability will be of key importance for both future research and technology.
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34
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Weiss PS, Bonnell DA, Hammond PT, Willson CG, Lewis PA. ACS Nano. Our paper anniversary. ACS NANO 2008; 2:1505-1506. [PMID: 19206351 DOI: 10.1021/nn800484t] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/27/2023]
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