Reference : Topological states in multi-orbital ​HgTe honeycomb lattices
Scientific journals : Article
Physical, chemical, mathematical & earth Sciences : Physics
http://hdl.handle.net/10993/20325
Topological states in multi-orbital ​HgTe honeycomb lattices
English
Beugeling, Wouter [Max-Planck-Institut für Physik komplexer Systeme, Nöthnitzer Straße 38, 01187 Dresden, Germany]
Kalesaki, Efterpi mailto [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]
10-Mar-2015
Nature Communications
Nature Publishing Group
6
6316
Yes (verified by ORBilu)
International
2041-1723
London
United Kingdom
[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.
Researchers ; Professionals
http://hdl.handle.net/10993/20325
10.1038/ncomms7316
http://www.nature.com/ncomms/2015/150310/ncomms7316/full/ncomms7316.html

File(s) associated to this reference

Fulltext file(s):

FileCommentaryVersionSizeAccess
Open access
ncomms7316.pdfPublisher postprint942.83 kBView/Open

Bookmark and Share SFX Query

All documents in ORBilu are protected by a user license.