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Chin. Phys. B, 2021, Vol. 30(7): 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
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.
Keywords:  Majorana bound states      quantum dots      conductance      antiresonance  
Received:  17 February 2021      Revised:  29 March 2021      Accepted manuscript online:  06 April 2021
PACS:  73.23.Hk (Coulomb blockade; single-electron tunneling)  
  73.50.Lw (Thermoelectric effects)  
  85.80.Fi (Thermoelectric devices)  
Fund: 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).
Corresponding Authors:  Wei-Jiang Gong     E-mail:

Cite this article: 

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 2021 Chin. Phys. B 30 077307

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