Level-oscillation-induced pump effect in a quantum dot with asymmetric constrictions

Mou Yang and Shu-Shen Li
Phys. Rev. B 71, 125307 – Published 11 March 2005

Abstract

We have investigated the pump effect induced by the level oscillation in a quantum dot with asymmetric constrictions. The curve of pumped current versus the frequency of level oscillation undulates at zero temperature. The oscillation of the pumped current can be smeared by increasing the temperature and the coupling strength between the quantum dot and the leads. Either the temperature increase or the coupling strength enhancement can lead to a positive or negative effect on the pumped current, depending on the parameters of the quantum dot system. A larger level-oscillation magnitude results in a larger pumped current, especially in the low-frequency case. An analytical expression of the pumped current is obtained in the regime far from adiabatic. A convenient physical picture based on our analytic result is proposed, with which we can explain all the features of the pumped current curves.

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  • Received 27 April 2004

DOI:https://doi.org/10.1103/PhysRevB.71.125307

©2005 American Physical Society

Authors & Affiliations

Mou Yang and Shu-Shen Li*

  • State Key Laboratory for Superlattices and Microstructures, Institute of Semiconductors, Chinese Academy of Sciences, Beijing 100083, China

  • *Corresponding author. Email address: sslee@red.semi.ac.cn

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Issue

Vol. 71, Iss. 12 — 15 March 2005

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