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arXiv 1208.1802cond-mat.mes-hall
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光子诱导量子输运的热效应

Thermal Effects on Photon-Induced Quantum Transport

M. O. Assunção, E. J. R. de Oliveira, J. M. Villas-Bôas, F. M. Souza

摘要:

从理论上研究了电接触下的二能级量子点中的激光诱导量子输运。我们的方法,基于非平衡格林函数技术,允许包括光子诱导的量子输运和激子相干动力学的热效应。通过求解一组耦合的积分微分方程,涉及相关和传播函数,我们得到的光电流和点占领作为时间的函数。特征相干拉比振荡被发现在职业和光电流,与两个不同的源退相干:非相干隧穿和热波动。特别地,对于增加的温度,点变得更加热占据,这收缩了拉比振荡的振幅,由于泡利阻塞。最后,由于光子和热诱导电子布居之间的相互作用,光电流可以随着时间的推移而切换符号,并且可以通过调谐激光强度来最大化其稳态值。

英文摘要:

We theoretically investigate laser induced quantum transport in a two-level quantum dot attached to electric contacts. Our approach, based on nonequilibrium Green function technique, allows to include thermal effects on the photon-induced quantum transport and excitonic coherent dynamics. By solving a set of coupled integrodifferential equations, involving correlation and propagator functions, we obtain the photocurrent and the dot occupations as a function of time. The characteristic coherent Rabi oscillations are found in both occupations and photocurrent, with two distinct sources of decoherence: incoherent tunneling and thermal fluctuations. In particular, for increasing temperature the dot becomes more thermally occupied which shrinks the amplitude of the Rabi oscillations, due to Pauli blockade. Finally, due to the interplay between photon and thermal induced electron populations, the photocurrent can switch sign as time evolves and its stationary value can be maximized by tunning the laser intensity.

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