实验证据表明 PbBi4Te7 中存在隐藏的拓扑表面态。

Experimental evidence of hidden topological surface states in PbBi4Te7.

机构信息

Hiroshima Synchrotron Radiation Center (HSRC), Hiroshima University, 2-313 Kagamiyama, Higashi-Hiroshima 739-0046, Japan.

出版信息

Phys Rev Lett. 2013 Nov 15;111(20):206803. doi: 10.1103/PhysRevLett.111.206803. Epub 2013 Nov 12.

DOI:10.1103/PhysRevLett.111.206803

PMID:24289701

Abstract

A topological surface state that is protected physically under the Bi2Te3-like five-layer block has been revealed on the Pb-based topological insulator (TI) PbBi4Te7 by bulk sensitive angle-resolved photoelectron spectroscopy (ARPES). Furthermore, conservation of the spin polarization of the hidden topological surface states is directly confirmed by bulk-sensitive spin ARPES observation. This finding paves the way to realize the real spintronics devices by TIs that are operable in the real environment.

摘要

通过体相敏感角分辨光电子能谱（ARPES），在基于 Pb 的拓扑绝缘体（TI）PbBi4Te7 上揭示了一种受 Bi2Te3 类似的五层层块物理保护的拓扑表面态。此外，通过体相敏感自旋 ARPES 观测，直接证实了隐藏拓扑表面态的自旋极化的守恒性。这一发现为在实际环境中工作的 TI 实现真正的自旋电子器件铺平了道路。