Topological states in multi-orbital HgTe ...
Document type :
Compte-rendu et recension critique d'ouvrage
DOI :
Title :
Topological states in multi-orbital HgTe honeycomb lattices
Author(s) :
Beugeling, W. [Auteur]
Max Planck Institute for Physics
Kalesaki, E. [Auteur]
Institut d’Électronique, de Microélectronique et de Nanotechnologie - UMR 8520 [IEMN]
Delerue, Christophe [Auteur]
Institut d’Électronique, de Microélectronique et de Nanotechnologie - UMR 8520 [IEMN]
Niquet, Yann-Michel [Auteur]
Nanostructures et Magnétisme [NM]
Vanmaekelbergh, D. [Auteur]
Debye Institute for Nanomaterials Science
Smith, C. Morais [Auteur]
Institute for Theoretical Physics [Utrecht]
Max Planck Institute for Physics
Kalesaki, E. [Auteur]
Institut d’Électronique, de Microélectronique et de Nanotechnologie - UMR 8520 [IEMN]
Delerue, Christophe [Auteur]

Institut d’Électronique, de Microélectronique et de Nanotechnologie - UMR 8520 [IEMN]
Niquet, Yann-Michel [Auteur]
Nanostructures et Magnétisme [NM]
Vanmaekelbergh, D. [Auteur]
Debye Institute for Nanomaterials Science
Smith, C. Morais [Auteur]
Institute for Theoretical Physics [Utrecht]
Journal title :
Nature Communications
Pages :
6316
Publisher :
Nature Publishing Group
Publication date :
2015-03-10
ISSN :
2041-1723
English keyword(s) :
Massless Dirac Fermions
Quantum-Wells
Graphene
Nanostructures
Superlattices
Insulators
Transition
Attachment
Silicon
Gas
Quantum-Wells
Graphene
Nanostructures
Superlattices
Insulators
Transition
Attachment
Silicon
Gas
HAL domain(s) :
Physique [physics]
English 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 ...
Show more >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.Show less >
Show more >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.Show less >
Language :
Anglais
Popular science :
Non
ANR Project :
Source :
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