Physics – Condensed Matter – Mesoscale and Nanoscale Physics
Scientific paper
2011-01-25
European Physical Journal B, 85, 3 (2012)
Physics
Condensed Matter
Mesoscale and Nanoscale Physics
10 pages, 6 figures, accepted by Eur. Phys. J. B. Springer (2012, April 3). Quantum information motion control is now improved
Scientific paper
10.1140/epjb/e2012-30027-1
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.
Chen Qing-Hu
Li Baowen
Ren Jie
Wang Chen
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