arXivDaily arXiv每日学术速递 周一至周五更新
arXiv周末暂无论文更新,休息一下吧,周末愉快~~
arXiv 2006.01716cond-mat.supr-concond-mat.mtrl-sci
收藏

铌衬底上拓扑(Bi $_{1-x}$ Sb $_{x})_2$ Te $_3$)薄膜中邻近对的大量抑制

Massive suppression of proximity pairing in topological (Bi$_{1-x}$Sb$_{x})_2$Te$_3$ films on niobium

Joseph A. Hlevyack, Sahand Najafzadeh, Meng-Kai Lin, Takahiro Hashimoto, Tsubaki Nagashima, Akihiro Tsuzuki, Akiko Fukushima, Cédric Bareille, Yang Bai, Peng Ch… 展开作者

Joseph A. Hlevyack, Sahand Najafzadeh, Meng-Kai Lin, Takahiro Hashimoto, Tsubaki Nagashima, Akihiro Tsuzuki, Akiko Fukushima, Cédric Bareille, Yang Bai, Peng Chen, Ro-Ya Liu, Yao Li, David Flötotto, José Avila, James N. Eckstein, Shik Shin, Kozo Okazaki, T. -C. Chiang

摘要:

将体导电拓扑Bi $_2$ Se $_3$薄膜与s波超导体相连接,在非平凡的表面态中产生强超导有序.然而,在体Nb上的体绝缘拓扑(Bi $_{1-x}$ Sb $_{x})_2$ Te $_3$)膜反而表现出表面超导性的巨大衰减,即使对于仅两层厚的膜也是如此。这种对邻近配对的大规模抑制通过超高分辨率能带图和通过将量化的超导能隙与重n掺杂拓扑Bi $_2$ Se $_3$ /Nb的超导能隙进行对比而得到证明。结果强调了利用超导邻近效应在近本征系统中实现拓扑超导性的局限性。

英文摘要:

Interfacing bulk conducting topological Bi$_2$Se$_3$ films with s-wave superconductors initiates strong superconducting order in the nontrivial surface states. However, bulk insulating topological (Bi$_{1-x}$Sb$_{x})_2$Te$_3$ films on bulk Nb instead exhibit a giant attenuation of surface superconductivity, even for films only two-layers thick. This massive suppression of proximity pairing is evidenced by ultrahigh-resolution band mappings and by contrasting quantified superconducting gaps with those of heavily n-doped topological Bi$_2$Se$_3$/Nb. The results underscore the limitations of using superconducting proximity effects to realize topological superconductivity in nearly intrinsic systems.

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。

↑