Experimental evidence of hidden topological surface states in PbBi4Te7

Taichi Okuda; Takamasa Maegawa; Mao Ye; Kaito Shirai; Takuya Warashina; Koji Miyamoto; Kenta Kuroda; Masashi Arita; Ziya S Aliev; Imamaddin R Amiraslanov; Mahammad B Babanly; Evgueni V Chulkov; Sergey V Eremeev; Akio Kimura; Hirofumi Namatame; Masaki Taniguchi

doi:10.1103/PhysRevLett.111.206803

Experimental evidence of hidden topological surface states in PbBi4Te7

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

Authors

Taichi Okuda¹, Takamasa Maegawa, Mao Ye, Kaito Shirai, Takuya Warashina, Koji Miyamoto, Kenta Kuroda, Masashi Arita, Ziya S Aliev, Imamaddin R Amiraslanov, Mahammad B Babanly, Evgueni V Chulkov, Sergey V Eremeev, Akio Kimura, Hirofumi Namatame, Masaki Taniguchi

Affiliation

¹ Hiroshima Synchrotron Radiation Center (HSRC), Hiroshima University, 2-313 Kagamiyama, Higashi-Hiroshima 739-0046, Japan.

PMID: 24289701
DOI: 10.1103/PhysRevLett.111.206803

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.