Article (Scientific journals)
Topological states in multi-orbital ​HgTe honeycomb lattices
Beugeling, Wouter; Kalesaki, Efterpi; Delerue, Christophe et al.
2015In Nature Communications, 6 (6316)
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Abstract :
[en] Research on graphene has revealed remarkable phenomena arising in the honeycomb lattice. However, the quantum spin Hall effect predicted at the K point could not be observed in graphene and other honeycomb structures of light elements due to an insufficiently strong spin–orbit coupling. Here we show theoretically that 2D honeycomb lattices of ​HgTe can combine the effects of the honeycomb geometry and strong spin–orbit coupling. The conduction bands, experimentally accessible via doping, can be described by a tight-binding lattice model as in graphene, but including multi-orbital degrees of freedom and spin–orbit coupling. This results in very large topological gaps (up to 35 meV) and a flattened band detached from the others. Owing to this flat band and the sizable Coulomb interaction, honeycomb structures of ​HgTe constitute a promising platform for the observation of a fractional Chern insulator or a fractional quantum spin Hall phase.
Disciplines :
Physics
Author, co-author :
Beugeling, Wouter;  Max-Planck-Institut für Physik komplexer Systeme, Nöthnitzer Straße 38, 01187 Dresden, Germany
Kalesaki, Efterpi ;  University of Luxembourg > Faculty of Science, Technology and Communication (FSTC) > Physics and Materials Science Research Unit
Delerue, Christophe;  IEMN-Department ISEN, UMR CNRS 8520, 41 Boulevard Vauban, 59046 Lille, France
Niquet, Yann-Michel;  Université Grenoble Alpes, INAC-SP2M, L_Sim, 17 avenue des Martyrs, 38054 Grenoble, France ; CEA, INAC-SP2M, L_Sim, 17 avenue des Martyrs, 38054 Grenoble, France
Vanmaekelbergh, Daniel;  Debye Institute for Nanomaterials Science, Utrecht University, Princetonplein 1, 3584 CC Utrecht, The Netherlands
Morais Smith, Cristiane;  Institute for Theoretical Physics, Center for Extreme Matter and Emergent Phenomena, Utrecht University, Leuvenlaan 4, 3584 CE Utrecht, The Netherlands
Language :
English
Title :
Topological states in multi-orbital ​HgTe honeycomb lattices
Publication date :
10 March 2015
Journal title :
Nature Communications
ISSN :
2041-1723
Publisher :
Nature Publishing Group, London, United Kingdom
Volume :
6
Issue :
6316
Peer reviewed :
Peer Reviewed verified by ORBi
Available on ORBilu :
since 10 March 2015

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