Результаты исследований: Научные публикации в периодических изданиях › статья › Рецензирование
Towards microscopic control of the magnetic exchange coupling at the surface of a topological insulator. / Rüßmann, Philipp; Mahatha, Sanjoy K.; Sessi, Paolo и др.
в: JPhys Materials, Том 1, № 1, 015002, 12.2018.Результаты исследований: Научные публикации в периодических изданиях › статья › Рецензирование
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TY - JOUR
T1 - Towards microscopic control of the magnetic exchange coupling at the surface of a topological insulator
AU - Rüßmann, Philipp
AU - Mahatha, Sanjoy K.
AU - Sessi, Paolo
AU - Valbuena, Miguel A.
AU - Bathon, Thomas
AU - Fauth, Kai
AU - Godey, Sylvie
AU - Mugarza, Aitor
AU - Kokh, Konstantin A.
AU - Tereshchenko, Oleg E.
AU - Gargiani, Pierluigi
AU - Valvidares, Manuel
AU - Jiménez, Erika
AU - Brookes, Nicholas B.
AU - Bode, Matthias
AU - Bihlmayer, Gustav
AU - Blügel, Stefan
AU - Mavropoulos, Phivos
AU - Carbone, Carlo
AU - Barla, Alessandro
N1 - Publisher Copyright: © 2018 The Author(s). Published by IOP Publishing Ltd Copyright: Copyright 2021 Elsevier B.V., All rights reserved.
PY - 2018/12
Y1 - 2018/12
N2 - Magnetically doped topological insulators may produce novel states of electronic matter, where for instance the quantum anomalous Hall effect state can be realized. Pivotal to this goal is a microscopic control over the magnetic state, defined by the local electronic structure of the dopants and their interactions. We report on the magnetic coupling among Mn or Co atoms adsorbed on the surface of the topological insulator Bi2Te3. Our findings uncover the mechanisms of the exchange coupling between magnetic atoms coupled to the topological surface state in strong topological insulators. The combination of x-ray magnetic circular dichroism and ab initio calculations reveals that the sign of the magnetic coupling at short adatom-adatom distances is opposite for Mn with respect to Co. For both elements, the magnetic exchange reverses its sign at a critical distance between magnetic adatoms, as a result of the interplay between superexchange, double exchange and Ruderman-Kittel-Kasuya-Yoshida interactions.
AB - Magnetically doped topological insulators may produce novel states of electronic matter, where for instance the quantum anomalous Hall effect state can be realized. Pivotal to this goal is a microscopic control over the magnetic state, defined by the local electronic structure of the dopants and their interactions. We report on the magnetic coupling among Mn or Co atoms adsorbed on the surface of the topological insulator Bi2Te3. Our findings uncover the mechanisms of the exchange coupling between magnetic atoms coupled to the topological surface state in strong topological insulators. The combination of x-ray magnetic circular dichroism and ab initio calculations reveals that the sign of the magnetic coupling at short adatom-adatom distances is opposite for Mn with respect to Co. For both elements, the magnetic exchange reverses its sign at a critical distance between magnetic adatoms, as a result of the interplay between superexchange, double exchange and Ruderman-Kittel-Kasuya-Yoshida interactions.
KW - Density functional theory (DFT)
KW - Magnetic exchange interaction
KW - Quantum anomalous Hall effect
KW - Ruderman-Kittel-Kasuya-Yoshida (RKKY) interaction
KW - Topological insulators
KW - X-ray magnetic circular dichroism (XMCD)
UR - http://www.scopus.com/inward/record.url?scp=85077496865&partnerID=8YFLogxK
U2 - 10.1088/2515-7639/aad02a
DO - 10.1088/2515-7639/aad02a
M3 - Article
AN - SCOPUS:85077496865
VL - 1
JO - JPhys Materials
JF - JPhys Materials
SN - 2515-7639
IS - 1
M1 - 015002
ER -
ID: 28463986