Dissipative timedependent quantum transport theory: Quantum interference and phonon induced decoherence dynamics
Abstract
A timedependent inelastic electron transport theory for strong electronphonon interaction is established via the equations of motion method combined with the small polaron transformation. In this work, the dissipation via electronphonon coupling is taken into account in the strong coupling regime, which validates the small polaron transformation. The corresponding equations of motion are developed, which are used to study the quantum interference effect and phononinduced decoherence dynamics in molecular junctions. Numerical studies show clearly quantum interference effect of the transport electrons through two quasidegenerate states with different couplings to the leads. We also found that the quantum interference can be suppressed by the electronphonon interaction where the phase coherence is destroyed by phonon scattering. This indicates the importance of electronphonon interaction in systems with prominent quantum interference effect.
 Authors:

 Department of Chemistry, The University of Hong Kong, Pokfulam Road, Hong Kong (China)
 Publication Date:
 OSTI Identifier:
 22415693
 Resource Type:
 Journal Article
 Journal Name:
 Journal of Chemical Physics
 Additional Journal Information:
 Journal Volume: 142; Journal Issue: 16; Other Information: (c) 2015 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 00219606
 Country of Publication:
 United States
 Language:
 English
 Subject:
 71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; ELECTRIC CONTACTS; ELECTRONPHONON COUPLING; ELECTRONS; EQUATIONS OF MOTION; INTERFERENCE; NUMERICAL ANALYSIS; PHONONS; POLARONS; QUANTUM DECOHERENCE; SCATTERING; SEMICONDUCTOR JUNCTIONS; TIME DEPENDENCE; TRANSFORMATIONS; TRANSPORT THEORY
Citation Formats
Zhang, Yu, Chen, GuanHua, Yam, ChiYung, and Beijing Computational Science Research Center, Beijing 100084. Dissipative timedependent quantum transport theory: Quantum interference and phonon induced decoherence dynamics. United States: N. p., 2015.
Web. doi:10.1063/1.4918771.
Zhang, Yu, Chen, GuanHua, Yam, ChiYung, & Beijing Computational Science Research Center, Beijing 100084. Dissipative timedependent quantum transport theory: Quantum interference and phonon induced decoherence dynamics. United States. doi:10.1063/1.4918771.
Zhang, Yu, Chen, GuanHua, Yam, ChiYung, and Beijing Computational Science Research Center, Beijing 100084. Tue .
"Dissipative timedependent quantum transport theory: Quantum interference and phonon induced decoherence dynamics". United States. doi:10.1063/1.4918771.
@article{osti_22415693,
title = {Dissipative timedependent quantum transport theory: Quantum interference and phonon induced decoherence dynamics},
author = {Zhang, Yu and Chen, GuanHua and Yam, ChiYung and Beijing Computational Science Research Center, Beijing 100084},
abstractNote = {A timedependent inelastic electron transport theory for strong electronphonon interaction is established via the equations of motion method combined with the small polaron transformation. In this work, the dissipation via electronphonon coupling is taken into account in the strong coupling regime, which validates the small polaron transformation. The corresponding equations of motion are developed, which are used to study the quantum interference effect and phononinduced decoherence dynamics in molecular junctions. Numerical studies show clearly quantum interference effect of the transport electrons through two quasidegenerate states with different couplings to the leads. We also found that the quantum interference can be suppressed by the electronphonon interaction where the phase coherence is destroyed by phonon scattering. This indicates the importance of electronphonon interaction in systems with prominent quantum interference effect.},
doi = {10.1063/1.4918771},
journal = {Journal of Chemical Physics},
issn = {00219606},
number = 16,
volume = 142,
place = {United States},
year = {2015},
month = {4}
}