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arXiv · 1603.04540

Protected gap closing in Josephson junctions constructed on Bi$_2$Te$_3$ surface

Zhaozheng Lyu·Yuan Pang·Junhua Wang·Guang Yang·Jie Fan·Guangtong Liu·Zhongqing Ji·Xiunian Jing·Changli Yang·Li Lu
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Abstract

On the road of searching for Majorana zero modes (MZMs) in topological insulator-based Josephson junctions, a highly-sought signature is the protected full transparency of electron transport through the junctions due to the existence of the MZMs, associated with complete gap closing between the electron-like and hole-like Andreev bound states (ABSs). Here, we present direct experimental evidence of gap closing and full transparency in single Josephson junctions constructed on the surface of three-dimensional topological insulator (3D TI) Bi$_2$Te$_3$. Our results demonstrate that the 2D surface of 3D TIs provides a promising platform for hosting and manipulating MZMs.

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Zhaozheng Lyu, Yuan Pang, Junhua Wang, Guang Yang, Jie Fan, Guangtong Liu, Zhongqing Ji, Xiunian Jing, Changli Yang, Li Lu. 2016-03-15. Protected gap closing in Josephson junctions constructed on Bi$_2$Te$_3$ surface. https://doi.org/10.1088/1674-1056/25/11/117402

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