Quantum transport of double quantum dots coupled to an oscillator in arbitrary strong coupling regime

Regular Article

Abstract

In this paper, we investigate the quantum transport of a double quantum dot coupled with a nanomechanical resonator at arbitrary strong electron-phonon coupling regimes. We employ the generalized quantum master equation to study full counting statistics of currents. We demonstrate the coherent phonon states method can be applied to decouple the electron-phonon interaction non-perturbatively. With the help of this non-perturbative treatment of electron-phonon couplings, we find that the phonon-assisted resonant tunneling emerges when the excess energy from the left quantum dot to the right one can excite integer number of phonons and multi-phonon excitations can enhance the transport in strong electron-phonon coupling regime. Moreover, we find that as the electron-phonon coupling increases, it first plays a constructive role to assist the transport, and then plays the role of scattering and strongly represses the transport.

Keywords

Mesoscopic and Nanoscale Systems 

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Copyright information

© EDP Sciences, SIF, Springer-Verlag Berlin Heidelberg 2012

Authors and Affiliations

  1. 1.Department of PhysicsZhejiang UniversityHangzhouP.R. China
  2. 2.Department of Physics and Centre for Computational Science and EngineeringNational University of SingaporeSingaporeRepublic of Singapore
  3. 3.NUS Graduate School for Integrative Sciences and EngineeringSingaporeRepublic of Singapore
  4. 4.Center for Statistical and Theoretical Condensed Matter PhysicsZhejiang Normal UniversityJinhuaP.R. China

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