Noise signatures for determining chiral Majorana fermion modes

Noise signatures for determining chiral Majorana fermion modes
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用于确定手性马约拉纳费米子模式的噪声特征

DOI:
10.1103/physrevb.98.045141
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发表时间:
2018-04
期刊:
影响因子:
3.7
通讯作者:
Xie X. C.
Xie X. C.
中科院分区:
物理与天体物理2区
文献类型:
--
作者:
Li Yu-Hang;Liu Jie;Liu Haiwen;Jiang Hua;Sun Qing-Feng;Xie X. C.

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本文报道了量子反常霍尔绝缘体-超导体结构中半量子平台的电导测量[Q。L. He \textit{et al.},Science 357,294-299(2017)],这表明手性马约拉纳费米子模式的存在。然而,这种半量子化电导平台也可能源于无序诱导的金属相。为了确定确切的机制,我们研究了这样一个系统中存在的强障碍的传输特性。结果表明,这两种机制的局部电流密度分布是不同的。特别地,可以使用电流噪声测量来区分它们,而无需进一步制造电流实验装置。
The conductance measurement of a half quantized plateau in a quantum anomalous Hall insulator-superconductor structure is reported by a recent experiment [Q. L. He \textit{et al.}, Science 357, 294-299 (2017)], which suggests the existence of the chiral Majorana fermion modes. However, such half quantized conductance plateau may also originates from a disorder-induced metallic phase. To identify the exact mechanism, we study the transport properties of such a system in the presence of strong disorders. Our results show that the local current density distributions of these two mechanisms are different. In particular, the current noises measurement can be used to distinguish them without any further fabrication of current experimental setup.
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