Jie Shen, Yue Ding, Yuan Pang, Fan Yang, Fanming Qu, Zhongqing Ji, Xiunian Jing, Jie Fan, Guangtong Liu, Changli Yang, Genghua Chen, Li Lu
Much attention has been paid to search for p-wave superconductivity whose edge would support Majorana modes, related to a mysterious type of fermions predicted seven decades ago and newly believed to be useful in realizing topological quantum computation. Possible signs of p-wave superconductivity were observed previously in organic superconductors, heavy fermion superconductors, Sr2RuO4, the 5/2 fractional quantum Hall state of two-dimensional electron gas, and recently in hybrid systems composed of s-wave superconductors and strong spin-orbit coupling materials}. However, an agreement has not yet been reached. In this work, we have designed and constructed particular types of superconducting quantum interference devices at the surface of topological insulator candidate Bi2Te3 by utilizing superconducting proximity effect. Two types of Cooper pair interference patterns have been observed. One arises from a zero-phase loop inhabited in the bulk of Bi2Te3, and the other arises from an arbitrary-phase loop formed involving in the surface states. The results are consistent with the scenario that chiral p-wave-like superconductivity occurs at the Bi2Te3 surface.
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http://arxiv.org/abs/1303.5598
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