Semiclassical transport through a mesostructure and distribution of classical trajectories

Zhang, Yanhui; Kang, Lisha; Xu, Xiulan; Tang, Xu; Li, Hongbo; X, Cai

doi:10.1142/s0217984917300046

Cited by 3 publications

(1 citation statement)

References 65 publications

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“…In recent years, driven by the potential application of quantum information science, the double quantum dot (DQD) system with its unique quantum properties and strong controllability has become an effective model for quantum measurement and quantum transport. [35][36][37][38] As a measuring instrument, the quantum point contact (QPC) is widely used to mea-sure the position of electron in the DQD owing to its high sensitivity. [39][40][41][42][43] The disturbance of the external environment leads to many interesting phenomena in the dynamical evolution of open quantum systems.…”

Section: Introductionmentioning

confidence: 99%

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

Jiang¹,

Lan²,

Lin³

et al. 2021

Chinese Phys. B

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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 τε 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.

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Section: Introductionmentioning

confidence: 99%

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

Jiang¹,

Lan²,

Lin³

et al. 2021

Chinese Phys. B

Self Cite

View full text Add to dashboard Cite

show abstract

Dynamics of an open double quantum dot system via quantum measurement

Lan

Kang

et al. 2020

Phys. Rev. B

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The electron transfer properties of an open double quantum dot based on a quantum point contact

Lan¹,

Du²,

Kang³

et al. 2020

Acta Phys. Sin.

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We theoretically study the electron transfer properties of a double quantum dot system in dissipative and pure dephasing environments based on a quantum dot contact detector. Theoretical results show that in the dissipative environment, the decoherence caused by the detector would increase the stable value of the average current and Fano factor as functions of time. Meanwhile, we find the existence of the quantum Zeno effect during the process of dynamical evolution. In the case of symmetric DQD, the relaxation caused by the dissipative environment would decrease the amplitude of the average current with time evolution and increase the value of the Fano factor in the long time limit. In the case of asymmetric DQD, the relaxation reduces the peak value of Fano factor over time. In the pure dephasing environment, we find that the frequent measurement would hinder the switch between different current channels during the cotunneling process. This results in a high value of Fano factor. In the case of symmetric DQD, increasing the pure dephasing rate would improve the value of Fano factor. In the case of asymmetric DQD, the dynamical evolution with time is not sensitive to the pure dephasing rate. In addition, it is indicated that the transfer probability of electron in the detector is only affected by the coupling between QPC and DQD. The environments have no effect on the transfer of a single electron in the detector. Our theoretical results provide theoretical references for experimental researchers to study the electron transport properties.

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Semiclassical transport through a mesostructure and distribution of classical trajectories

Cited by 3 publications

References 65 publications

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

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

Dynamics of an open double quantum dot system via quantum measurement

The electron transfer properties of an open double quantum dot based on a quantum point contact

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