Spectroscopic signature of surface states and bunching of bulk subbands in topological insulator (Bi0.4Sb0.6)2Te3 thin films

被引：1

作者：

Mulder, Liesbeth ^{[1
]}

Castenmiller, Carolien ^{[1
]}

Witmans, Femke J. ^{[1
]}

Smit, Steef ^{[2
]}

Golden, Mark S. ^{[2
]}

Zandvliet, Harold J. W. ^{[1
]}

de Boeij, Paul L. ^{[1
]}

Brinkman, Alexander ^{[1
]}

机构：

[1] Univ Twente, MESA Inst Nanotechnol, NL-7500 AE Enschede, Netherlands

[2] Univ Amsterdam, Van der Waals Zeeman Inst, Inst Phys, NL-1098 XH Amsterdam, Netherlands

来源：

PHYSICAL REVIEW B | 2022年 / 105卷 / 03期

关键词：

SINGLE DIRAC CONE; SB2TE3;

D O I：

10.1103/PhysRevB.105.035122

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

High-quality thin films of the topological insulator (Bi0.4Sb0.6)(2)Te-3 have been deposited on SrTiO3 (111) by molecular beam epitaxy. Their electronic structure was investigated by in situ angle-resolved photoemission spectroscopy and in situ scanning tunneling spectroscopy. The experimental results reveal striking similarities with relativistic ab initio tight-binding calculations. We find that ultrathin slabs of the three-dimensional topological insulator (Bi0.4Sb0.6)(2)Te-3 display topological surface states, surface states with large weight on the outermost Te atomic layer, and dispersive bulk energy levels that are quantized. We observe that the bandwidth of the bulk levels is strongly reduced. These bunched bulk states as well as the surface states give rise to strong peaks in the local density of states.

引用

页数：7

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