We have investigated the conductance spectra of Sn-Bi2Se3 interface junctions down to 250 mK and in different magnetic fields. A number of conductance anomalies were observed below the superconducting transition temperature of Sn, including a small gap different from that of Sn, and a zero-bias conductance peak growing up at lower temperatures. We discussed the possible origins of the smaller gap and the zero-bias conductance peak. These phenomena support that a proximity-effect-induced chiral superconducting phase is formed at the interface between the superconducting Sn and the strong spin-orbit coupling material Bi2Se3.
@article{arxiv.1105.0229,
title = {Proximity effect at superconducting Sn-Bi2Se3 interface},
author = {Fan Yang and Yue Ding and Fanming Qu and Jie Shen and Jun Chen and Zhongchao Wei and Zhongqing Ji and Guangtong Liu and Jie Fan and Changli Yang and Tao Xiang and Li Lu},
journal= {arXiv preprint arXiv:1105.0229},
year = {2012}
}