Electron and phonon drag in thermoelectric transport through coherent molecular conductors

Jing-Tao Lü, Jian-Sheng Wang, Per Hedegård, and Mads Brandbyge
Phys. Rev. B 93, 205404 – Published 4 May 2016

Abstract

We study thermoelectric transport through a coherent molecular conductor connected to two electron and two phonon baths using the nonequilibrium Green's function method. We focus on the mutual drag between electron and phonon transport as a result of ‘momentum’ transfer, which happens only when there are at least two phonon degrees of freedom. After deriving expressions for the linear drag coefficients, obeying the Onsager relation, we further investigate their effect on nonequilibrium transport. We show that the drag effect is closely related to two other phenomena: (1) adiabatic charge pumping through a coherent conductor; (2) the current-induced nonconservative and effective magnetic forces on phonons.

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  • Received 24 January 2016
  • Revised 12 April 2016

DOI:https://doi.org/10.1103/PhysRevB.93.205404

©2016 American Physical Society

Physics Subject Headings (PhySH)

Condensed Matter, Materials & Applied Physics

Authors & Affiliations

Jing-Tao Lü1,*, Jian-Sheng Wang2, Per Hedegård3, and Mads Brandbyge4

  • 1School of Physics and Wuhan National High Magnetic Field Center, Huazhong University of Science and Technology, 430074 Wuhan, China
  • 2Department of Physics, National University of Singapore, 117551 Singapore, Republic of Singapore
  • 3Niels Bohr Institute and Nano-Science Center, University of Copenhagen, 2100 Copenhagen Ø, Denmark
  • 4Center for Nanostructured Graphene (CNG), Department of Micro- and Nanotechnology, Technical University of Denmark, DK-2800 Kongens Lyngby, Denmark

  • *jtlu@hust.edu.cn

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Issue

Vol. 93, Iss. 20 — 15 May 2016

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