Suppression of leakage effect of Majorana bound states in the T-shaped quantum-dot structure

doi:10.1088/1674-1056/abf4f8

中国物理B ›› 2021, Vol. 30 ›› Issue (7): 77307-077307.doi: 10.1088/1674-1056/abf4f8

Suppression of leakage effect of Majorana bound states in the T-shaped quantum-dot structure

Wei-Jiang Gong(公卫江)^1,†, Yu-Hang Xue(薛宇航)¹, Xiao-Qi Wang(王晓琦)², Lian-Lian Zhang(张莲莲)¹, and Guang-Yu Yi(易光宇)¹

1 College of Sciences, Northeastern University, Shenyang 110819, China;
2 Basic department, Yingkou Institute of Technology, Yingkou 115014, China

收稿日期:2021-02-17 修回日期:2021-03-29 接受日期:2021-04-06 出版日期:2021-06-22 发布日期:2021-06-24
通讯作者: Wei-Jiang Gong E-mail:gwj@mail.neu.edu.cn
基金资助:
Project supported by the LiaoNing Revitalization Talents Program (Grant No. XLYC1907033), the Fundamental Research Funds for the Central Universities, China (Grant No. N2002005), and the National Natural Science Foundation of China (Grant No. 11905027).

Suppression of leakage effect of Majorana bound states in the T-shaped quantum-dot structure

Wei-Jiang Gong(公卫江)^1,†, Yu-Hang Xue(薛宇航)¹, Xiao-Qi Wang(王晓琦)², Lian-Lian Zhang(张莲莲)¹, and Guang-Yu Yi(易光宇)¹

1 College of Sciences, Northeastern University, Shenyang 110819, China;
2 Basic department, Yingkou Institute of Technology, Yingkou 115014, China

Received:2021-02-17 Revised:2021-03-29 Accepted:2021-04-06 Online:2021-06-22 Published:2021-06-24
Contact: Wei-Jiang Gong E-mail:gwj@mail.neu.edu.cn
Supported by:
Project supported by the LiaoNing Revitalization Talents Program (Grant No. XLYC1907033), the Fundamental Research Funds for the Central Universities, China (Grant No. N2002005), and the National Natural Science Foundation of China (Grant No. 11905027).

摘要/Abstract

摘要： We theoretically study the transport properties in the T-shaped double-quantum-dot structure, by considering the dot in the main channel to be coupled to the Majorana bound state (MBS) at one end of the topological superconducting nanowire. It is found that the side-coupled dot governs the effect of the MBS on the transport behavior. When its level is consistent with the energy zero point, the MBS contributes little to the conductance spectrum. Otherwise, the linear conductance exhibits notable changes according to the inter-MBS coupling manners. In the absence of inter-MBS coupling, the linear conductance value keeps equal to e²/2h when the level of the side-coupled dot departs from the energy zero point. However, the linear conductance is always analogous to the MBS-absent case once the inter-MBS coupling comes into play. These findings provide new information about the leakage effect of MBSs in quantum-dot structures.

关键词: Majorana bound states, quantum dots, conductance, antiresonance

Abstract: We theoretically study the transport properties in the T-shaped double-quantum-dot structure, by considering the dot in the main channel to be coupled to the Majorana bound state (MBS) at one end of the topological superconducting nanowire. It is found that the side-coupled dot governs the effect of the MBS on the transport behavior. When its level is consistent with the energy zero point, the MBS contributes little to the conductance spectrum. Otherwise, the linear conductance exhibits notable changes according to the inter-MBS coupling manners. In the absence of inter-MBS coupling, the linear conductance value keeps equal to e²/2h when the level of the side-coupled dot departs from the energy zero point. However, the linear conductance is always analogous to the MBS-absent case once the inter-MBS coupling comes into play. These findings provide new information about the leakage effect of MBSs in quantum-dot structures.

Key words: Majorana bound states, quantum dots, conductance, antiresonance

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

73.23.Hk

73.50.Lw (Thermoelectric effects) 85.80.Fi (Thermoelectric devices)

Wei-Jiang Gong(公卫江), Yu-Hang Xue(薛宇航), Xiao-Qi Wang(王晓琦), Lian-Lian Zhang(张莲莲), and Guang-Yu Yi(易光宇). Suppression of leakage effect of Majorana bound states in the T-shaped quantum-dot structure[J]. 中国物理B, 2021, 30(7): 77307-077307.

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Suppression of leakage effect of Majorana bound states in the T-shaped quantum-dot structure

Suppression of leakage effect of Majorana bound states in the T-shaped quantum-dot structure

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