Sputtering-induced reemergence of the topological surface state in Bi2Se3

被引：13

作者：

Queiroz, Raquel ^{[1
]}

Landolt, Gabriel ^{[2
,3
]}

Muff, Stefan ^{[3
,4
]}

Slomski, Bartosz ^{[2
,3
]}

Schmitt, Thorsten ^{[3
]}

Strocov, Vladimir N. ^{[3
]}

Mi, Jianli ^{[5
]}

Iversen, Bo Brummerstedt ^{[5
]}

Hofmann, Philip ^{[5
]}

Osterwalder, Juerg ^{[2
]}

Schnyder, Andreas P. ^{[1
]}

Dil, J. Hugo ^{[3
,4
]}

机构：

[1] Max Planck Inst Festkorperforsch, Heisenbergstr 1, D-70569 Stuttgart, Germany

[2] Univ Zurich, Inst Phys, Winterthurerstr 190, CH-8057 Zurich, Switzerland

[3] Paul Scherrer Inst, Swiss Light Source, CH-5232 Villigen, Switzerland

[4] Ecole Polytech Fed Lausanne, Inst Phys, CH-1015 Lausanne, Switzerland

[5] Aarhus Univ, Dept Phys & Astron, Interdisciplinary Nanosci Ctr, DK-8000 Aarhus C, Denmark

来源：

PHYSICAL REVIEW B | 2016年 / 93卷 / 16期

基金：

美国国家科学基金会; 新加坡国家研究基金会; 瑞士国家科学基金会;

关键词：

SINGLE DIRAC CONE; PHASE-TRANSITION; SPIN TEXTURE; INSULATOR; SUPERCONDUCTORS; BI2TE3;

D O I：

10.1103/PhysRevB.93.165409

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

We study the fate of the surface states of Bi2Se3 under disorder with strength larger than the bulk gap, caused by neon sputtering and nonmagnetic adsorbates. We find that neon sputtering introduces strong but dilute defects, which can be modeled by a unitary impurity distribution, whereas adsorbates, such as water vapor or carbon monoxide, are best described by Gaussian disorder. Remarkably, these two disorder types have a dramatically different effect on the surface states. Our soft x-ray angle-resolved photoemission spectroscopy (ARPES) measurements combined with numerical simulations show that unitary surface disorder pushes the Dirac state to inward quintuplet layers, burying it below an insulating surface layer. As a consequence, the surface spectral function becomes weaker but retains its quasiparticle peak. This is in contrast to Gaussian disorder, which smears out the quasiparticle peak completely. At the surface of Bi2Se3, neon sputtering adds additional unitary scatterers to the Gaussian disorder of the adsorbates. Since the introduced unitary disorder pushes the surface state to inward layers, the effects of Gaussian disorder are reduced. As a result the ARPES signal becomes sharper upon sputtering.

引用

页数：7

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