In-Plane Magnetic Anisotropy of Fe Atoms on Bi2Se3(111)

被引：144

作者：

Honolka, J. ^{[2
]}

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

Sessi, V.

Wehling, T. O. ^{[4
,5
,6
]}

Stepanow, S. ^{[2
]}

Mi, J. -L. ^{[7
]}

Iversen, B. B. ^{[7
]}

Schlenk, T. ^{[1
]}

Wiebe, J.

Brookes, N. B. ^{[3
]}

Lichtenstein, A. I. ^{[4
]}

Hofmann, Ph. ^{[8
]}

Kern, K. ^{[2
,9
]}

Wiesendanger, R. ^{[1
]}

机构：

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

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

[3] European Synchrotron Radiat Facil, F-38043 Grenoble, France

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

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

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

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

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

[9] Ecole Polytech Fed Lausanne, Inst Phys Mat Condense, CH-1015 Lausanne, Switzerland

来源：

PHYSICAL REVIEW LETTERS | 2012年 / 108卷 / 25期

基金：

新加坡国家研究基金会;

关键词：

AUGMENTED-WAVE METHOD; ULTRASOFT PSEUDOPOTENTIALS; TOPOLOGICAL INSULATORS; SURFACE;

D O I：

10.1103/PhysRevLett.108.256811

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

The robustness of the gapless topological surface state hosted by a 3D topological insulator against perturbations of magnetic origin has been the focus of recent investigations. We present a comprehensive study of the magnetic properties of Fe impurities on the prototypical 3D topological insulator Bi2Se3 using local low-temperature scanning tunneling spectroscopy and integral x-ray magnetic circular dichroism techniques. Single Fe adatoms on the Bi2Se3 surface, in the coverage range approximate to 1% of a monolayer, are heavily relaxed into the surface and exhibit a magnetic easy axis within the surface plane, contrary to what was assumed in recent investigations on the supposed opening of a gap. Using ab initio approaches, we demonstrate that an in-plane easy axis arises from the combination of the crystal field and dynamic hybridization effects.

引用

页数：5

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