1
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Cohen G, Galperin M. Green’s function methods for single molecule junctions. J Chem Phys 2020; 152:090901. [DOI: 10.1063/1.5145210] [Citation(s) in RCA: 25] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/12/2023] Open
Affiliation(s)
- 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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2
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Olson D, Boscoboinik A, Tysoe WT. Chemical self-assembly strategies for designing molecular electronic circuits. Chem Commun (Camb) 2019; 55:13872-13875. [PMID: 31674624 DOI: 10.1039/c9cc07200d] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Design principles are demonstrated for fabricating molecular electronic circuits using the inherently self-limiting growth of molecular wires between gold nanoparticles from the oligomerization of 1,4-phenylene diisocyanide.
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Affiliation(s)
- Dustin Olson
- Department of Chemistry and Biochemistry and Laboratory for Surface Studies, University of Wisconsin-Milwaukee, Milwaukee, WI 53211, USA.
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3
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Abstract
Utilization of electron transfer methods for description of quantum transport is popular due to simplicity of the formulation and its ability to account for basic physics of electron exchange between the system and baths. At the same time, the necessity to go beyond simple golden rule-type expressions for rates was indicated in the literature and ad hoc formulations were proposed. Similarly, kinetic schemes for quantum transport beyond the usual second-order Lindblad/Redfield considerations were discussed. Here we utilize recently introduced the nonequilibrium Hubbard Green's function diagrammatic technique to analyze the construction of rates in open systems. We show that previous considerations for rates of second and fourth order can be obtained as a particular case of zero- and second-order Green's function diagrammatic series with bare diagrams. We discuss limitations of previous considerations, stress advantages of the Hubbard Green's function approach in constructing the rates, and indicate that standard dressing of the diagrams is a natural way to account for additional baths/degrees of freedom in the formulation of generalized expressions for the rates.
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Affiliation(s)
- Nicolas Bergmann
- Department of Chemistry , Technical University of Munich , D-85748 Garching , Germany
| | - Michael Galperin
- Department of Chemistry & Biochemistry , University of California San Diego , La Jolla , California 92093 , United States
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4
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Miwa K, Imada H, Imai-Imada M, Kimura K, Galperin M, Kim Y. Many-Body State Description of Single-Molecule Electroluminescence Driven by a Scanning Tunneling Microscope. NANO LETTERS 2019; 19:2803-2811. [PMID: 30694065 DOI: 10.1021/acs.nanolett.8b04484] [Citation(s) in RCA: 16] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/24/2023]
Abstract
Electron transport and optical properties of a single molecule in contact with conductive materials have attracted considerable attention because of their scientific importance and potential applications. With the recent progress in experimental techniques, especially by virtue of scanning tunneling microscope (STM)-induced light emission, where the tunneling current of the STM is used as an atomic-scale source for induction of light emission from a single molecule, it has become possible to investigate single-molecule properties at subnanometer spatial resolution. Despite extensive experimental studies, the microscopic mechanism of electronic excitation of a single molecule in STM-induced light emission has yet to be clarified. Here we present a formulation of single-molecule electroluminescence driven by electron transfer between a molecule and metal electrodes based on a many-body state representation of the molecule. The effects of intramolecular Coulomb interaction on conductance and luminescence spectra are investigated using the nonequilibrium Hubbard Green's function technique combined with first-principles calculations. We compare simulation results with experimental data and find that the intramolecular Coulomb interaction is crucial for reproducing recent experiments for a single phthalocyanine molecule. The developed theory provides a unified description of the electron transport and optical properties of a single molecule in contact with metal electrodes driven out of equilibrium, and thereby, it contributes to a microscopic understanding of optoelectronic conversion in single molecules on solid surfaces and in nanometer-scale junctions.
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Affiliation(s)
- Kuniyuki Miwa
- Surface and Interface Science Laboratory , RIKEN , Wako , Saitama 351-0198 , Japan
- Department of Chemistry and Biochemistry , University of California, San Diego , La Jolla , California 92093 , United States
| | - Hiroshi Imada
- Surface and Interface Science Laboratory , RIKEN , Wako , Saitama 351-0198 , Japan
| | - Miyabi Imai-Imada
- Surface and Interface Science Laboratory , RIKEN , Wako , Saitama 351-0198 , Japan
- Department of Advanced Materials Science, Graduate School of Frontier Science , The University of Tokyo , Kashiwa , Chiba 277-8651 , Japan
| | - Kensuke Kimura
- Surface and Interface Science Laboratory , RIKEN , Wako , Saitama 351-0198 , Japan
- Department of Advanced Materials Science, Graduate School of Frontier Science , The University of Tokyo , Kashiwa , Chiba 277-8651 , Japan
| | - Michael Galperin
- Department of Chemistry and Biochemistry , University of California, San Diego , La Jolla , California 92093 , United States
| | - Yousoo Kim
- Surface and Interface Science Laboratory , RIKEN , Wako , Saitama 351-0198 , Japan
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5
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Chen F, Ochoa MA, Galperin M. Nonequilibrium diagrammatic technique for Hubbard Green functions. J Chem Phys 2017. [DOI: 10.1063/1.4965825] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
Affiliation(s)
- Feng Chen
- Department of Physics, University of California, San Diego, La Jolla, California 92093, USA
| | - Maicol A. Ochoa
- Department of Chemistry and Biochemistry, University of California, San Diego, La Jolla, California 92093, USA
| | - Michael Galperin
- Department of Chemistry and Biochemistry, University of California, San Diego, La Jolla, California 92093, USA
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6
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Feng Q, Yamada A, Baer R, Dunietz BD. Deleterious Effects of Exact Exchange Functionals on Predictions of Molecular Conductance. J Chem Theory Comput 2016; 12:3431-5. [PMID: 27454778 DOI: 10.1021/acs.jctc.6b00493] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Kohn-Sham (KS) density functional theory (DFT) describes well the atomistic structure of molecular junctions and their coupling to the semi-infinite metallic electrodes but severely overestimates conductance due to the spuriously large density of charge-carrier states of the KS system. Previous works show that inclusion of appropriate amounts of nonlocal exchange in the functional can fix the problem and provide realistic conductance estimates. Here however we discover that nonlocal exchange can also lead to deleterious effects which artificially overestimate transmittance even beyond the KS-DFT prediction. The effect is a result of exchange coupling between nonoverlapping states of diradical character. We prescribe a practical recipe for eliminating such artifacts.
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Affiliation(s)
- Qingguo Feng
- Department of Chemistry and Biochemistry, Kent State University , Kent, Ohio 44242, United States
| | - Atsushi Yamada
- Department of Chemistry and Biochemistry, Kent State University , Kent, Ohio 44242, United States
| | - Roi Baer
- Fritz Haber Center for Molecular Dynamics, Institute of Chemistry, The Hebrew University of Jerusalem , Jerusalem 91904, Israel
| | - Barry D Dunietz
- Department of Chemistry and Biochemistry, Kent State University , Kent, Ohio 44242, United States
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7
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Galperin M, Nitzan A. Nuclear Dynamics at Molecule-Metal Interfaces: A Pseudoparticle Perspective. J Phys Chem Lett 2015; 6:4898-4903. [PMID: 26589690 DOI: 10.1021/acs.jpclett.5b02331] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
We discuss nuclear dynamics at molecule-metal interfaces including nonequilibrium molecular junctions. Starting from the many-body states (pseudoparticle) formulation of the molecule-metal system in the molecular vibronic basis, we introduce gradient expansion to reduce the adiabatic nuclear dynamics (that is, nuclear dynamics on a single molecular potential surface) into its semiclassical form while maintaining the effect of the nonadiabatic electronic transitions between different molecular charge states. This yields a set of equations for the nuclear dynamics in the presence of these nonadiabatic transitions, which reproduce the surface-hopping formulation in the limit of small metal-molecule coupling (where broadening of the molecular energy levels can be disregarded) and Ehrenfest dynamics (motion on the potential of mean force) when information on the different charging states is traced out.
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Affiliation(s)
- Michael Galperin
- Department of Chemistry and Biochemistry, University of California at San Diego , La Jolla, California 92093, United States
| | - Abraham Nitzan
- Department of Chemistry, University of Pennsylvania , Philadelphia, Pennsylvania 19104, United States
- School of Chemistry, Tel Aviv University , Tel Aviv, 69978, Israel
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8
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Cao H, Zhang M, Tao T, Song M, Zhang C. Electric response of a metal-molecule-metal junction to laser pulse by solving hierarchical equations of motion. J Chem Phys 2015; 142:084705. [DOI: 10.1063/1.4913466] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
Affiliation(s)
- Hui Cao
- Jiangsu Key Laboratory of Atmospheric Environment Monitoring and Pollution Control, School of Environmental Science and Engineering, Nanjing University of Information Science and Technology, Nanjing 210044, Jiangsu, People’s Republic of China
| | - Mingdao Zhang
- Jiangsu Key Laboratory of Atmospheric Environment Monitoring and Pollution Control, School of Environmental Science and Engineering, Nanjing University of Information Science and Technology, Nanjing 210044, Jiangsu, People’s Republic of China
| | - Tao Tao
- Jiangsu Key Laboratory of Atmospheric Environment Monitoring and Pollution Control, School of Environmental Science and Engineering, Nanjing University of Information Science and Technology, Nanjing 210044, Jiangsu, People’s Republic of China
| | - Mingxia Song
- Jiangsu Key Laboratory of Atmospheric Environment Monitoring and Pollution Control, School of Environmental Science and Engineering, Nanjing University of Information Science and Technology, Nanjing 210044, Jiangsu, People’s Republic of China
| | - Chaozhi Zhang
- Jiangsu Key Laboratory of Atmospheric Environment Monitoring and Pollution Control, School of Environmental Science and Engineering, Nanjing University of Information Science and Technology, Nanjing 210044, Jiangsu, People’s Republic of China
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9
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Zhu WH, Ding GH, Dong B. Negative differential conductance and hysteretic current switching of benzene molecular junction in a transverse electric field. NANOTECHNOLOGY 2014; 25:465202. [PMID: 25355705 DOI: 10.1088/0957-4484/25/46/465202] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
We study charge transport through single benzene molecular junction (BMJ) directly sandwiched between two platinum electrodes by using a tight-binding model and the non-equilibrium Green's function approach. Pronounced negative differential conductance is observed at finite bias voltage, resulting from charge redistribution in BMJ and a Coulomb blockade effect at the interface of molecule-electrode contacts. In the presence of a transverse electric field, hysteretic switching behavior and large spin-polarization of current are obtained, indicating the potential application of BMJ for acting as a nanoscale current modulator or spintronic molecular device.
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Affiliation(s)
- Wen-Huan Zhu
- Key Laboratory of Artificial Structures and Quantum Control (Ministry of Education), Department of Physics and Astronomy, Shanghai Jiao Tong University, 800 Dongchuan Road, Shanghai 200240, People's Republic of China
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10
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Ochoa MA, Galperin M, Ratner MA. A non-equilibrium equation-of-motion approach to quantum transport utilizing projection operators. JOURNAL OF PHYSICS. CONDENSED MATTER : AN INSTITUTE OF PHYSICS JOURNAL 2014; 26:455301. [PMID: 25318540 DOI: 10.1088/0953-8984/26/45/455301] [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
We consider a projection operator approach to the non-equilibrium Green function equation-of-motion (PO-NEGF EOM) method. The technique resolves problems of arbitrariness in truncation of an infinite chain of EOMs and prevents violation of symmetry relations resulting from the truncation (equivalence of left- and right-sided EOMs is shown and symmetry with respect to interchange of Fermi or Bose operators before truncation is preserved). The approach, originally developed by Tserkovnikov (1999 Theor. Math. Phys. 118 85) for equilibrium systems, is reformulated to be applicable to time-dependent non-equilibrium situations. We derive a canonical form of EOMs, thus explicitly demonstrating a proper result for the non-equilibrium atomic limit in junction problems. A simple practical scheme applicable to quantum transport simulations is formulated. We perform numerical simulations within simple models and compare results of the approach to other techniques and (where available) also to exact results.
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Affiliation(s)
- Maicol A Ochoa
- Department of Chemistry & Biochemistry, University of California San Diego, La Jolla, CA 92093, USA
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11
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Kirk ML, Shultz DA, Stasiw DE, Habel-Rodriguez D, Stein B, Boyle PD. Electronic and Exchange Coupling in a Cross-Conjugated D–B–A Biradical: Mechanistic Implications for Quantum Interference Effects. J Am Chem Soc 2013; 135:14713-25. [DOI: 10.1021/ja405354x] [Citation(s) in RCA: 40] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/24/2023]
Affiliation(s)
- Martin L. Kirk
- Department of
Chemistry, The University of New Mexico, MSC03 2060, Albuquerque, New Mexico 87131-0001, United States
| | - David A. Shultz
- Department of
Chemistry, North Carolina State University, Raleigh, North Carolina 27695-8204, United States
| | - Daniel E. Stasiw
- Department of
Chemistry, North Carolina State University, Raleigh, North Carolina 27695-8204, United States
| | - Diana Habel-Rodriguez
- Department of
Chemistry, The University of New Mexico, MSC03 2060, Albuquerque, New Mexico 87131-0001, United States
| | - Benjamin Stein
- Department of
Chemistry, The University of New Mexico, MSC03 2060, Albuquerque, New Mexico 87131-0001, United States
| | - Paul D. Boyle
- Department of
Chemistry, North Carolina State University, Raleigh, North Carolina 27695-8204, United States
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12
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Abstract
Previously unknown benzenepolyselenols have been synthesized and isolated in their acetyl-protected form. The two molecules 1,3,5-tris(acetylseleno)benzene and 1,2,4,5-tetrakis(acetylseleno)benzene were synthesized by the reductive dealkylation in Na/NH(3) of 1,3,5-tris(tert-butylseleno)benzene and 1,2,4,5-tetrakis(tert-butylseleno)benzene, respectively. Hexakis(tert-butylseleno)benzene was also synthesized and structurally characterized by single-crystal X-ray diffraction, but it was not possible to isolate hexakis(acetylseleno)benzene. The synthetic methodology is likely to be useful in the synthesis of other areneselenols.
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Affiliation(s)
- Dayna L Turner
- Department of Chemistry, The University of Alabama, Tuscaloosa, Alabama 35487, USA
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13
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14
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Zhou Y, Ernzerhof M. Open-system Kohn-Sham density functional theory. J Chem Phys 2012; 136:094105. [DOI: 10.1063/1.3687922] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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15
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Migliore A, Schiff P, Nitzan A. On the relationship between molecular state and single electron pictures in simple electrochemical junctions. Phys Chem Chem Phys 2012; 14:13746-53. [DOI: 10.1039/c2cp41442b] [Citation(s) in RCA: 48] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
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16
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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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17
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Solomon GC, Bergfield JP, Stafford CA, Ratner MA. When "small" terms matter: Coupled interference features in the transport properties of cross-conjugated molecules. BEILSTEIN JOURNAL OF NANOTECHNOLOGY 2011; 2:862-71. [PMID: 22259770 PMCID: PMC3257512 DOI: 10.3762/bjnano.2.95] [Citation(s) in RCA: 30] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/20/2011] [Accepted: 11/25/2011] [Indexed: 05/23/2023]
Abstract
Quantum interference effects offer opportunities to tune the electronic and thermoelectric response of a quantum-scale device over orders of magnitude. Here we focus on single-molecule devices, in which interference features may be strongly affected by both chemical and electronic modifications to the system. Although not always desirable, such a susceptibility offers insight into the importance of "small" terms, such as through-space coupling and many-body charge-charge correlations. Here we investigate the effect of these small terms using different Hamiltonian models with Hückel, gDFTB and many-body theory to calculate the transport through several single-molecule junctions, finding that terms that are generally thought to only slightly perturb the transport instead produce significant qualitative changes in the transport properties. In particular, we show that coupling of multiple interference features in cross-conjugated molecules by through-space coupling will lead to splitting of the features, as can correlation effects. The degeneracy of multiple interference features in cross-conjugated molecules appears to be significantly more sensitive to perturbations than those observed in equivalent cyclic systems and this needs to be considered if such supernodes are required for molecular thermoelectric devices.
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Affiliation(s)
- Gemma C Solomon
- Nano-Science Center and Department of Chemistry, University of Copenhagen, Universitetsparken 5, 2100 Copenhagen Ø, Denmark
| | - Justin P Bergfield
- Nano-Science Center and Department of Chemistry, University of Copenhagen, Universitetsparken 5, 2100 Copenhagen Ø, Denmark
| | - Charles A Stafford
- Department of Physics, University of Arizona, 1118 East Fourth Street, Tucson, AZ 85721, USA
| | - Mark A Ratner
- Department of Chemistry, Northwestern University, 2145 Sheridan Rd, Evanston, IL 60208, USA
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18
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Turner DL, Stone KH, Stephens PW, Walsh A, Singh MP, Vaid TP. Synthesis, Characterization, and Calculated Electronic Structure of the Crystalline Metal–Organic Polymers [Hg(SC6H4S)(en)]n and [Pb(SC6H4S)(dien)]n. Inorg Chem 2011; 51:370-6. [DOI: 10.1021/ic201779a] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Dayna L. Turner
- Department
of Chemistry, The University of Alabama, Tuscaloosa, Alabama 35487,
United States
| | - Kevin H. Stone
- Department
of Physics and Astronomy, Stony Brook University, Stony Brook, New York 11794,
United States
| | - Peter W. Stephens
- Department
of Physics and Astronomy, Stony Brook University, Stony Brook, New York 11794,
United States
| | - Aron Walsh
- Centre for
Sustainable Chemical
Technologies and Department
of Chemistry, University of Bath, Claverton
Down, Bath BA2 7AY, U.K
| | - Mayank Pratap Singh
- Department
of Chemistry, The University of Alabama, Tuscaloosa, Alabama 35487,
United States
| | - Thomas P. Vaid
- Department
of Chemistry, The University of Alabama, Tuscaloosa, Alabama 35487,
United States
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19
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Bergfield JP, Solomon GC, Stafford CA, Ratner MA. Novel quantum interference effects in transport through molecular radicals. NANO LETTERS 2011; 11:2759-2764. [PMID: 21661755 DOI: 10.1021/nl201042m] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/30/2023]
Abstract
We investigate electronic transport through molecular radicals and predict a correlation-induced transmission node arising from destructive interference between transport contributions from different charge states of the molecule. This quantum interference effect has no single-particle analog and cannot be described by effective single-particle theories. Large errors in the thermoelectric properties and nonlinear current-voltage response of molecular radical junctions are introduced when the complementary wave and particle aspects of the electron are not properly treated. A method to accurately calculate the low-energy transport through a radical-based junction using an Anderson model is given.
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Affiliation(s)
- Justin P Bergfield
- Department of Chemistry, University of California, Irvine, California 92697, United States.
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20
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Abstract
Theories of molecular electronic devices (MEDs) are quite involved in general. However, various prominent features of MEDs can be understood drawing only on elementary quantum theory. To support this point of view, we provide a two component orbital theory that enables one to reproduce various important features of MEDs. In this theory, the device orbitals are divided into two components, each of which is obtained from simple rules. To illustrate our two-component model, we apply it to explain, among other things, the conductance suppression in cross-conjugated systems and the dependence of the conductance on the contact position in aromatic systems.
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Affiliation(s)
- Matthias Ernzerhof
- Département de Chimie, Université de Montréal, C.P. 6128 Succursale A, Montréal, Québec H3C 3J7, Canada.
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21
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Abstract
The source-sink potential (SSP) model introduced previously [F. Goyer, M. Ernzerhof, and M. Zhuang, J. Chem. Phys. 126, 144104 (2007)] enables one to eliminate the semi-infinite contacts in molecular electronic devices (MEDs) in favor of complex potentials. SSP has originally been derived for independent electrons and extended to interacting two-electron systems subsequently [A. Goker, F. Goyer, and M. Ernzerhof, J. Chem. Phys. 129, 194901 (2008)]. Here we generalize SSP to N-electron systems and consider the impact of electron correlation on the transmission probability. In our correlated method for molecular conductors, the molecular part of the Hückel Hamiltonian of the original SSP is replaced by the Hubbard Hamiltonian. For the contacts, however, the single-electron picture is retained and they are assumed to be spin polarized. Using our method, we study electron transmission in molecular wires, cross-conjugated chains, as well as aromatic systems. We find that, for realistic values of the electron-electron repulsion parameter, correlation effects modify the transmission probability quantitatively, the qualitative features remain. However, we find subtle new effects in correlated MEDs, such as Coulomb drag, that are absent in uncorrelated systems.
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Affiliation(s)
- Francois Goyer
- Département de Chimie, Université de Montréal, Montréal, Québec, Canada
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22
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Leijnse M, Sun W, Nielsen MB, Hedegård P, Flensberg K. Interaction-induced negative differential resistance in asymmetric molecular junctions. J Chem Phys 2011; 134:104107. [DOI: 10.1063/1.3560474] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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23
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Rincón J, Hallberg K, Aligia AA, Ramasesha S. Quantum interference in coherent molecular conductance. PHYSICAL REVIEW LETTERS 2009; 103:266807. [PMID: 20366334 DOI: 10.1103/physrevlett.103.266807] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/07/2009] [Indexed: 05/29/2023]
Abstract
Coherent electronic transport through individual molecules is crucially sensitive to quantum interference. We investigate the zero-bias and zero-temperature conductance through pi-conjugated annulene molecules weakly coupled to two leads for different source-drain configurations, finding an important reduction for certain transmission channels and for particular geometries as a consequence of destructive quantum interference between states with definite momenta. When translational symmetry is broken by an external perturbation we find an abrupt increase of the conductance through those channels. Previous studies concentrated on the effect at the Fermi energy, where this effect is very small. By analyzing the effect of symmetry breaking on the main transmission channels we find a much larger response thus leading to the possibility of a larger switching of the conductance through single molecules.
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Affiliation(s)
- Julián Rincón
- Centro Atómico Bariloche and Instituto Balseiro, Comisión Nacional de Energía Atómica and CONICET, 8400 Bariloche, Argentina
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