Majorana fermion realization and relevant transport processes in a triple-quantum dot system

doi:10.1088/1674-1056/24/3/037302

中国物理B ›› 2015, Vol. 24 ›› Issue (3): 37302-037302.doi: 10.1088/1674-1056/24/3/037302

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

Majorana fermion realization and relevant transport processes in a triple-quantum dot system

邓明勋, 郑诗菡, 杨谋, 胡梁宾, 王瑞强

Laboratory of Quantum Engineering and Quantum Materials, ICMP and SPTE, South China Normal University, Guangzhou 510006, China

收稿日期:2014-08-18 修回日期:2014-10-10 出版日期:2015-03-05 发布日期:2015-03-05
基金资助:
Project supported by the New Century Excellent Talents in University of China (Grant No. NCET-10-0090), the National Natural Science Foundation of China (Grant Nos. 11474106, 11174088, and 11274124), the Program for Changjiang Scholars and Innovative Research Team in University of China (Grant No. IRT1243), and the Natural Science Foundation of Guangdong Province, China (Grant No. S2012010010681).

Majorana fermion realization and relevant transport processes in a triple-quantum dot system

Deng Ming-Xun (邓明勋), Zheng Shi-Han (郑诗菡), Yang Mou (杨谋), Hu Liang-Bin (胡梁宾), Wang Rui-Qiang (王瑞强)

Laboratory of Quantum Engineering and Quantum Materials, ICMP and SPTE, South China Normal University, Guangzhou 510006, China

Received:2014-08-18 Revised:2014-10-10 Online:2015-03-05 Published:2015-03-05
Contact: Wang Rui-Qiang E-mail:wangrqgz@163.com
Supported by:
Project supported by the New Century Excellent Talents in University of China (Grant No. NCET-10-0090), the National Natural Science Foundation of China (Grant Nos. 11474106, 11174088, and 11274124), the Program for Changjiang Scholars and Innovative Research Team in University of China (Grant No. IRT1243), and the Natural Science Foundation of Guangdong Province, China (Grant No. S2012010010681).

摘要/Abstract

摘要：

Nonequilibrium electronic transports through a system hosting three quantum dots hybridized with superconductors are investigated. By tuning the relative positions of the dot levels, we illustrate the existence of Majorana fermions and show that the Majorana feimions will either survive separately on single dots or distribute themselves among different dots with tunable probabilities. As a result, different physical mechanisms appear, including local Andreev reflection (LAR), cross Andreev reflection (CAR), and cross resonant tunneling (CRT). The resulting characteristics may be used to reveal the unique properties of Majorana fermions. In addition, we discuss the spin-polarized transports and find a pure spin current and a spin filter effect due to the joint effect of CRT and CAR, which is important for designing spintronic devices.

关键词: Majorana fermion, quantum dots hybridized with superconductors, spin-polarized transports

Abstract:

Key words: Majorana fermion, quantum dots hybridized with superconductors, spin-polarized transports

中图分类号: (Quantum dots)

73.21.La

74.45.+c (Proximity effects; Andreev reflection; SN and SNS junctions) 73.23.Hk (Coulomb blockade; single-electron tunneling)

邓明勋, 郑诗菡, 杨谋, 胡梁宾, 王瑞强. Majorana fermion realization and relevant transport processes in a triple-quantum dot system[J]. 中国物理B, 2015, 24(3): 37302-037302.

Deng Ming-Xun (邓明勋), Zheng Shi-Han (郑诗菡), Yang Mou (杨谋), Hu Liang-Bin (胡梁宾), Wang Rui-Qiang (王瑞强). Majorana fermion realization and relevant transport processes in a triple-quantum dot system[J]. Chin. Phys. B, 2015, 24(3): 37302-037302.

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Majorana fermion realization and relevant transport processes in a triple-quantum dot system

Majorana fermion realization and relevant transport processes in a triple-quantum dot system

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