Disorder-induced suppression of the zero-bias conductance peak splitting in topological superconducting nanowires

Beilstein Journal of Nanotechnology

Yong Guo¹  Sha-Sha Ke²  Jun-Tong Ren²  Huai-Wu Zhang²  Hai-Feng Lü² 

[1] Department of Physics and State Key Laboratory of Low-Dimensional Quantum Physics, Tsinghua University, Beijing 100084, China;State Key Laboratory of Electronic Thin Films and Integrated Devices and School of Physical Electronics, University of Electronic Science and Technology of China, Chengdu 610054, China;

关键词: conductance peak spacing;    disorder;    Majorana energy splitting;    shot noise;    zero-bias conductance;   

DOI  :  10.3762/bjnano.9.128

来源: DOAJ

【 摘 要 】

We investigate the effect of three types of intrinsic disorder, including that in pairing energy, chemical potential, and hopping amplitude, on the transport properties through the superconducting nanowires with Majorana bound states (MBSs). The conductance and the noise Fano factor are calculated based on a tight-binding model by adopting a non-equilibrium Green’s function method. It is found that the disorder can effectively lead to a reduction in the conductance peak spacings and significantly suppress the peak height. Remarkably, for a longer nanowire, the zero-bias peak could be reproduced by weak disorder for a finite Majorana energy splitting. It is interesting that the shot noise provides a signature to discriminate whether the zero-bias peak is induced by Majorana zero mode or disorder. For Majorana zero mode, the noise Fano factor approaches zero in the low bias voltage limit due to the resonant Andreev tunneling. However, the Fano factor is finite in the case of a disorder-induced zero-bias peak.

【 授权许可】

Unknown