Transition from the Kondo effect to a Coulomb blockade in an electron shuttle

doi:10.1088/1674-1056/22/11/117305

中国物理B ›› 2013, Vol. 22 ›› Issue (11): 117305-117305.doi: 10.1088/1674-1056/22/11/117305

• CONDENSED MATTER: ELECTRONIC STRUCTURE, ELECTRICAL, MAGNETIC, AND OPTICAL PROPERTIES • 上一篇下一篇

Transition from the Kondo effect to a Coulomb blockade in an electron shuttle

张荣, 楚卫东, 段素青, 杨宁

Institute of Applied Physics and Computational Mathematics, Beijing 100088, China

收稿日期:2013-05-06 修回日期:2013-05-30 出版日期:2013-09-28 发布日期:2013-09-28
基金资助:
Project supported by the National Natural Science Foundation of China (Grant No. 11204016).

Transition from the Kondo effect to a Coulomb blockade in an electron shuttle

Zhang Rong (张荣), Chu Wei-Dong (楚卫东), Duan Su-Qing (段素青), Yang Ning (杨宁)

Institute of Applied Physics and Computational Mathematics, Beijing 100088, China

Received:2013-05-06 Revised:2013-05-30 Online:2013-09-28 Published:2013-09-28
Contact: Yang Ning E-mail:yang_ning@iapcm.ac.cn
Supported by:
Project supported by the National Natural Science Foundation of China (Grant No. 11204016).

摘要/Abstract

摘要： We investigate the effect of the mechanical motion of a quantum dot on the transport properties of a quantum dot shuttle. Employing the equation of motion method for the nonequilibrium Green’s function, we show that the oscillation of the dot, i.e., the time-dependent coupling between the dot’s electron and the reservoirs, can destroy the Kondo effect. With the increase in the oscillation frequency of the dot, the density of states of the quantum dot shuttle changes from the Kondo-like to a Coulomb-blockade pattern. Increasing the coupling between the dot and the electrodes may partly recover the Kondo peak in the spectrum of the density of states. Understanding of the effect of mechanical motion on the transport properties of an electron shuttle is important for the future application of nanoelectromechanical devices.

关键词: quantum dot, electron shuttle, Kondo effect, Coulomb blockade

Abstract: We investigate the effect of the mechanical motion of a quantum dot on the transport properties of a quantum dot shuttle. Employing the equation of motion method for the nonequilibrium Green’s function, we show that the oscillation of the dot, i.e., the time-dependent coupling between the dot’s electron and the reservoirs, can destroy the Kondo effect. With the increase in the oscillation frequency of the dot, the density of states of the quantum dot shuttle changes from the Kondo-like to a Coulomb-blockade pattern. Increasing the coupling between the dot and the electrodes may partly recover the Kondo peak in the spectrum of the density of states. Understanding of the effect of mechanical motion on the transport properties of an electron shuttle is important for the future application of nanoelectromechanical devices.

Key words: quantum dot, electron shuttle, Kondo effect, Coulomb blockade

中图分类号: (Coulomb blockade; single-electron tunneling)

73.23.Hk

72.15.Qm (Scattering mechanisms and Kondo effect) 73.63.Kv (Quantum dots)

张荣, 楚卫东, 段素青, 杨宁. Transition from the Kondo effect to a Coulomb blockade in an electron shuttle[J]. 中国物理B, 2013, 22(11): 117305-117305.

Zhang Rong (张荣), Chu Wei-Dong (楚卫东), Duan Su-Qing (段素青), Yang Ning (杨宁). Transition from the Kondo effect to a Coulomb blockade in an electron shuttle[J]. Chin. Phys. B, 2013, 22(11): 117305-117305.

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Transition from the Kondo effect to a Coulomb blockade in an electron shuttle

Transition from the Kondo effect to a Coulomb blockade in an electron shuttle

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