Sr x Bi ₂ Se ₃ 中的超导与拓扑表面态。

Superconductivity with Topological Surface State in SrxBi₂Se₃.

机构信息

High Magnetic Field Laboratory, Chinese Academy of Sciences and University of Science and Technology of China , Hefei 230026, PR China.

Hefei National Laboratory for Physical Sciences at Microscale, University of Science and Technology of China , Hefei 230026, PR China.

出版信息

J Am Chem Soc. 2015 Aug 26;137(33):10512-5. doi: 10.1021/jacs.5b06815. Epub 2015 Aug 14.

DOI:10.1021/jacs.5b06815

PMID:26262431

Abstract

By intercalation of alkaline earth metal Sr in Bi2Se3, superconductivity with large shielding volume fraction (∼91.5% at 0.5 K) has been achieved in Sr0.065Bi2Se3. Analysis of the Shubnikov-de Hass oscillations confirms the half-shift expected from a Dirac spectrum, giving transport evidence of the existence of surface states. Importantly, SrxBi2Se3 superconductor is stable under air, making SrxBi2Se3 an ideal material base for investigating topological superconductivity.

摘要

通过在 Bi2Se3 中插入碱土金属 Sr，Sr0.065Bi2Se3 实现了超导，其屏蔽体积分数很大（在 0.5 K 时约为 91.5%）。Shubnikov-de Hass 振荡的分析证实了预期的狄拉克谱的半位移，为表面态的存在提供了传输证据。重要的是，SrxBi2Se3 超导体在空气中稳定，这使得 SrxBi2Se3 成为研究拓扑超导的理想材料基础。