中国物理B ›› 2020, Vol. 29 ›› Issue (7): 77302-077302.doi: 10.1088/1674-1056/ab8889

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

Probing the Majorana bound states in a hybrid nanowire double-quantum-dot system by scanning tunneling microscopy

Jia Liu(刘佳), Ke-Man Li(李科曼), Feng Chi(迟锋), Zhen-Guo Fu(付振国), Yue-Fei Hou(侯跃飞), Zhigang Wang(王志刚), Ping Zhang(张平)   

  1. 1 School of Science, Inner Mongolia University of Science and Technology, Baotou 014010, China;
    2 School of Electronic and Information Engineering, Zhongshan Institute, University of Electronic Science and Technology of China, Zhongshan 528400, China;
    3 Institute of Applied Physics and Computational Mathematics, Beijing 100088, China
  • 收稿日期:2020-01-08 修回日期:2020-04-07 出版日期:2020-07-05 发布日期:2020-07-05
  • 通讯作者: Ping Zhang E-mail:fu_zhenguo@iapcm.ac.cn;zhang_ping@iapcm.ac.cn
  • 基金资助:
    Project supported by the National Natural Science Foundation of China (Grant Nos. 11564029 and 11675023), the Natural Science Foundation of Inner Mongolia, China (Grant No. 2017MS0112), the Science Foundation for Excellent Youth Scholors of Inner Mongolia University of Science and Technology, China (Grant No. 2017YQL06), the Initial Project of UEST of China, Zhongshan Institute (Grant No. 415YKQ02), the Science and Technology Bureau of Zhongshan City, China (Grant Nos. 2017B1116 and 2017B1016), and the Innovation Team of Zhongshan City, China (Grant No. 180809162197886).

Probing the Majorana bound states in a hybrid nanowire double-quantum-dot system by scanning tunneling microscopy

Jia Liu(刘佳)1, Ke-Man Li(李科曼)1, Feng Chi(迟锋)2, Zhen-Guo Fu(付振国)3, Yue-Fei Hou(侯跃飞)3, Zhigang Wang(王志刚)3, Ping Zhang(张平)3   

  1. 1 School of Science, Inner Mongolia University of Science and Technology, Baotou 014010, China;
    2 School of Electronic and Information Engineering, Zhongshan Institute, University of Electronic Science and Technology of China, Zhongshan 528400, China;
    3 Institute of Applied Physics and Computational Mathematics, Beijing 100088, China
  • Received:2020-01-08 Revised:2020-04-07 Online:2020-07-05 Published:2020-07-05
  • Contact: Ping Zhang E-mail:fu_zhenguo@iapcm.ac.cn;zhang_ping@iapcm.ac.cn
  • Supported by:
    Project supported by the National Natural Science Foundation of China (Grant Nos. 11564029 and 11675023), the Natural Science Foundation of Inner Mongolia, China (Grant No. 2017MS0112), the Science Foundation for Excellent Youth Scholors of Inner Mongolia University of Science and Technology, China (Grant No. 2017YQL06), the Initial Project of UEST of China, Zhongshan Institute (Grant No. 415YKQ02), the Science and Technology Bureau of Zhongshan City, China (Grant Nos. 2017B1116 and 2017B1016), and the Innovation Team of Zhongshan City, China (Grant No. 180809162197886).

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摘要： We propose an interferometer composing of a scanning tunneling microscope (STM), double quantum dots (DQDs), and a semiconductor nanowire carrying Majorana bound states (MBSs) at its ends induced by the proximity effect of an s-wave superconductor, to probe the existence of the MBSs in the dots. Our results show that when the energy levels of DQDs are aligned to the energy of MBSs, the zero-energy spectral functions of DQDs are always equal to 1/2, which indicates the formation of the MBSs in the DQDs and is also responsible for the zero-bias conductance peak. Our findings suggest that the spectral functions of the DQDs may be an excellent and convenient quantity for detecting the formation and stability of the spatially separated MBSs in quantum dots.

关键词: quantum dot, scanning tunneling microscopy, Majorana bound states

Abstract: We propose an interferometer composing of a scanning tunneling microscope (STM), double quantum dots (DQDs), and a semiconductor nanowire carrying Majorana bound states (MBSs) at its ends induced by the proximity effect of an s-wave superconductor, to probe the existence of the MBSs in the dots. Our results show that when the energy levels of DQDs are aligned to the energy of MBSs, the zero-energy spectral functions of DQDs are always equal to 1/2, which indicates the formation of the MBSs in the DQDs and is also responsible for the zero-bias conductance peak. Our findings suggest that the spectral functions of the DQDs may be an excellent and convenient quantity for detecting the formation and stability of the spatially separated MBSs in quantum dots.

Key words: quantum dot, scanning tunneling microscopy, Majorana bound states

中图分类号:  (Quantum dots)

  • 73.21.La
68.37.Ef (Scanning tunneling microscopy (including chemistry induced with STM)) 05.60.Gg (Quantum transport)