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arXiv 1809.04752cond-mat.supr-con
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量子反常Hall绝缘体/超导体异质结边缘手征Majorana模的光谱指纹

Spectroscopic Fingerprint of Chiral Majorana Modes at the Edge of a Quantum Anomalous Hall Insulator / Superconductor Heterostructure

J. Shen, J. Lyu, J. Z. Gao, Y. -M. Xie, C. -Z. Chen, C. -w. Cho, O. Atanov, Z. Chen, K. Liu, Y. J. Hu, K. Y. Yip, S. K. Goh, Q. L. He, L. Pan, K. L. Wang, K. T. Law, R. Lortz

摘要:

量子反常霍尔绝缘体(QAHI)的发现,使得在没有外加磁场的情况下,通过在量子霍尔边缘态中引入超导性来制备新型拓扑超导体(SC)成为可能。在这种情况下,两个不同的拓扑超导相与一个或两个手征马约拉纳边缘模式的理论预测,其特征在于陈数(N)分别为1和2。我们目前的光谱证据Andreev反射实验中存在的手征马约拉纳模式的Nb /(Cr0.12Bi0.26Sb0.62)2 Te 3异质结构与不同的签名归因于两个不同的拓扑超导相。结果与理论预测在定性上吻合得很好。

英文摘要:

With the recent discovery of the quantum anomalous Hall insulator (QAHI), which exhibits the conductive quantum Hall edge states without external magnetic field, it becomes possible to create a novel topological superconductor (SC) by introducing superconductivity into these edge states. In this case, two distinct topological superconducting phases with one or two chiral Majorana edge modes were theoretically predicted, characterized by Chern numbers (N ) of 1 and 2, respectively. We present spectroscopic evidence from Andreev reflection experiments for the presence of chiral Majorana modes in a Nb / (Cr0.12Bi0.26Sb0.62)2Te3 heterostructure with distinct signatures attributed to two different topological superconducting phases. The results are in qualitatively good agreement with the theoretical predictions.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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