Parity independence of the zero-bias conductance peak in a nanowire based topological superconductor-quantum dot hybrid device

被引：79

作者：

Deng, M. T. ^{[1
]}

Yu, C. L. ^{[1
]}

Huang, G. Y. ^{[1
]}

Larsson, M. ^{[1
]}

Caroff, P. ^{[1
]}

Xu, H. Q. ^{[1
,2
,3
]}

机构：

[1] Lund Univ, Div Solid State Phys, S-22100 Lund, Sweden

[2] Peking Univ, Key Lab Phys & Chem Nanodevices, Beijing 100871, Peoples R China

[3] Peking Univ, Dept Elect, Beijing 100871, Peoples R China

来源：

SCIENTIFIC REPORTS | 2014年 / 4卷

基金：

中国国家自然科学基金; 瑞典研究理事会;

关键词：

MAJORANA FERMIONS; SUPERCURRENT; REVERSAL;

D O I：

10.1038/srep07261

中图分类号：

O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];

学科分类号：

07 ; 0710 ; 09 ;

摘要：

We explore the signatures of Majorana fermions in a nanowire based topological superconductor-quantum dot-topological superconductor hybrid device by charge transport measurements. At zero magnetic field, well-defined Coulomb diamonds and the Kondo effect are observed. Under the application of a finite, sufficiently strong magnetic field, a zero-bias conductance peak structure is observed. It is found that the zero-bias conductance peak is present in many consecutive Coulomb diamonds, irrespective of the even-odd parity of the quasi-particle occupation number in the quantum dot. In addition, we find that the zero-bias conductance peak is in most cases accompanied by two differential conductance peaks, forming a triple-peak structure, and the separation between the two side peaks in bias voltage shows oscillations closely correlated to the background Coulomb conductance oscillations of the device. The observed zero-bias conductance peak and the associated triple-peak structure are in line with Majorana fermion physics in such a hybrid topological system.

引用

页数：8

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