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arXiv 1101.4864cond-mat.mes-hallcond-mat.dis-nn
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任意强耦合态下耦合振子的双量子点的量子输运

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

Chen Wang, Jie Ren, Baowen Li, Qing-Hu Chen

摘要:

本文研究了双量子点与纳米机械谐振腔耦合系统在任意强电子-声子耦合条件下的量子输运。我们采用广义量子主方程来研究电流的全计数统计。我们证明了相干声子态方法可以用来非微扰地解耦电子-声子相互作用。通过对电子-声子耦合的非微扰处理,我们发现当从左量子点到右量子点的多余能量可以激发整数个声子时,声子辅助共振隧穿就出现了,在强电子-声子耦合区,多声子激发可以增强输运.此外,我们发现,随着电子-声子耦合的增加,它首先发挥建设性的作用,以协助运输,然后发挥散射的作用,并强烈抑制运输。

英文摘要:

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.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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