Topological states in multi-orbital HgTe honeycomb lattices - Archive ouverte HAL Access content directly
Journal Articles Nature Communications Year : 2015

Topological states in multi-orbital HgTe honeycomb lattices


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.
Fichier principal
Vignette du fichier
ncomms7316.pdf (946.71 Ko) Télécharger le fichier
Origin : Publication funded by an institution
Licence : CC BY - Attribution

Dates and versions

hal-01587149 , version 1 (12-07-2022)





W. Beugeling, E. Kalesaki, Christophe Delerue, Yann-Michel Niquet, D. Vanmaekelbergh, et al.. Topological states in multi-orbital HgTe honeycomb lattices. Nature Communications, 2015, 6, pp.6316. ⟨10.1038/ncomms7316⟩. ⟨hal-01587149⟩
103 View
13 Download



Gmail Facebook Twitter LinkedIn More