Electron transfer properties of double quantum dot system in a fluctuating environment

doi:10.1088/1674-1056/abd759

Abstract Using the innovative method of the additional Bloch vector, the electron transfer properties of a double quantum dot (DQD) system measured by a quantum point contact (QPC) in a fluctuating environment are investigated. The results show that the environmental noises in transverse and longitudinal directions play different roles in the dynamical evolution of the open quantum systems. Considering the DQD with symmetric energy level, the Fano factor exhibits a slight peak with the increase of transverse noise amplitude σ_T, which provides a basis for distinguishing dynamical phenomena caused by different directional fluctuation noises in symmetric DQD structures by studying the detector output. In the case of asymmetric DQD, the dependence of a detector current involving the level displacement is distinct when increasing the transverse noise damping coefficient τ_T and the longitudinal noise damping coefficient τ_ε respectively. Meanwhile, the transverse noise damping coefficient τ_T could significantly reduce the Fano factor and enhance the stability of the quantum system compared with the longitudinal one. The Fano factors with stable values as the enhancement of noise amplitudes show different external influences from the detector measurement, and provide a numerical reference for adjusting the noise amplitudes in both transverse and longitudinal directions appropriately in a microscopic experimental process to offset the decoherence effect caused by the measurements. Finally, the research of average waiting time provides unique insights to the development of single electron transfer theory in the short-time limit.

Keywords: double quantum dots fluctuating environment electron transfer noise

Received: 02 November 2020
Revised: 30 November 2020
Accepted manuscript online: 30 December 2020

PACS:	03.65.Yz	(Decoherence; open systems; quantum statistical methods)
	05.60.Gg	(Quantum transport)
	73.63.Kv	(Quantum dots)

Fund: Project supported by the Natural Science Foundation of Shandong Province, China (Grant No. ZR2014AM030).

Corresponding Authors: ^†These authors contributed equally. ^‡Corresponding author. E-mail: yhzhang@sdnu.edu.cn

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Lujing Jiang(姜露静), Kang Lan(蓝康), Zhenyu Lin(林振宇), and Yanhui Zhang(张延惠) Electron transfer properties of double quantum dot system in a fluctuating environment 2021 Chin. Phys. B 30 040307

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