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Proximity-effect-induced superconductivity by granular Pb film on the surface of Bi2Te3 topological insulator

Ding Yue Shen Jie Pang Yuan Liu Guang-Tong Fan Jie Ji Zhong-Qing Yang Chang-Li Lü Li

Proximity-effect-induced superconductivity by granular Pb film on the surface of Bi2Te3 topological insulator

Ding Yue, Shen Jie, Pang Yuan, Liu Guang-Tong, Fan Jie, Ji Zhong-Qing, Yang Chang-Li, Lü Li
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  • Received Date:  23 April 2013
  • Accepted Date:  09 May 2013
  • Published Online:  20 August 2013

Proximity-effect-induced superconductivity by granular Pb film on the surface of Bi2Te3 topological insulator

  • 1. Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Acadeny of Sciences, Beijing 100190, China
Fund Project:  Project supported by the National Basic Research Program of China (Grant Nos. 2009CB929101, 2011CB921702), the National Natural Science Foundation of China (Grant Nos. 91221203, 11174340, 11174357), and the Main Direction Program of Knowledge Innovation of Chinese Academy of Sciences.

Abstract: The appearance of topological insulators provides us with a chance of finding topological superconductors and Majorana fermions. To pursue these findings one might need to induce large areas of proximity superconductivity on the surface of Bi2Te3 by depositing granular and discrete Pb film. In this experiment, a superconducting state over a distance of 9.5 rm is observed below 0.25 K on a Bi2Te3 crystal whose surface is deposited with Pb grains with a thickness of less than 20 nm and separated at a distance of 20-30 nm.

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