Controllable Magnetic Doping of the Surface State of a Topological Insulator

被引：98

作者：

Schlenk, T. ^{[1
]}

Bianchi, M. ^{[2
]}

Koleini, M. ^{[3
]}

Eich, A. ^{[1
]}

Pietzsch, O. ^{[1
]}

Wehling, T. O. ^{[3
,4
]}

Frauenheim, T. ^{[3
]}

Balatsky, A. ^{[5
,6
,7
]}

Mi, J. -L. ^{[8
]}

Iversen, B. B. ^{[8
]}

Wiebe, J. ^{[1
]}

Khajetoorians, A. A. ^{[1
]}

Hofmann, Ph. ^{[2
]}

Wiesendanger, R. ^{[1
]}

机构：

[1] Univ Hamburg, Inst Appl Phys, D-20355 Hamburg, Germany

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

[3] Univ Bremen, Bremen Ctr Computat Mat Sci, D-28359 Bremen, Germany

[4] Univ Bremen, Inst Theoret Phys, D-28359 Bremen, Germany

[5] Los Alamos Natl Lab, Div Theoret, Los Alamos, NM 87545 USA

[6] Los Alamos Natl Lab, Ctr Integrated Nanotechnol, Los Alamos, NM 87545 USA

[7] Nord Inst Theoret Phys NORDITA, S-10691 Stockholm, Sweden

[8] Aarhus Univ, Interdisciplinary Nanosci Ctr, Dept Chem, Ctr Mat Crystallog, DK-8000 Aarhus C, Denmark

来源：

PHYSICAL REVIEW LETTERS | 2013年 / 110卷 / 12期

基金：

新加坡国家研究基金会;

关键词：

BI2SE3;

D O I：

10.1103/PhysRevLett.110.126804

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

A combined experimental and theoretical study of doping individual Fe atoms into Bi2Se3 is presented. It is shown through a scanning tunneling microscopy study that single Fe atoms initially located at hollow sites on top of the surface (adatoms) can be incorporated into subsurface layers by thermally activated diffusion. Angle-resolved photoemission spectroscopy in combination with ab initio calculations suggest that the doping behavior changes from electron donation for the Fe adatom to neutral or electron acceptance for Fe incorporated into substitutional Bi sites. According to first principles calculations within density functional theory, these Fe substitutional impurities retain a large magnetic moment, thus presenting an alternative scheme for magnetically doping the topological surface state. For both types of Fe doping, we see no indication of a gap at the Dirac point. DOI: 10.1103/PhysRevLett.110.126804

引用

页数：5

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