Title :

Room-temperature quantum spin Hall effect in HgTe honeycomb superlattices

Author(s) :

Morais Smith, Cristiane [Auteur]
Institute for Theoretical Physics [Utrecht]
Beugeling, Wouter [Auteur]
Max Planck Institute for the Physics of Complex Systems [MPI-PKS]
Kalesaki, Efterpi [Auteur]
Institut d’Électronique, de Microélectronique et de Nanotechnologie - UMR 8520 [IEMN]
Niquet, Yann-Michel [Auteur]
Service de Physique des Matériaux et Microstructures [SP2M - UMR 9002]
Delerue, Christophe [Auteur]
Institut d’Électronique, de Microélectronique et de Nanotechnologie - UMR 8520 [IEMN]
Vanmaekelbergh, Daniel [Auteur]
Debye Institute for Nanomaterials Science

Conference title :

American Physical Society March Meeting, APS March Meeting 2014, Session B31 - Focus Session : Computational Discovery and Design of New Materials II

City :

Denver, CO

Country :

Etats-Unis d'Amérique

Start date of the conference :

2014

English abstract : [en]

The recent experimental realization of self-assembled honeycomb superlattices of truncated semiconducting nanocrystals has opened a new path to engineer graphene-like structures. Atomistic band-structure calculations for ...
Show more >The recent experimental realization of self-assembled honeycomb superlattices of truncated semiconducting nanocrystals has opened a new path to engineer graphene-like structures. Atomistic band-structure calculations for honeycomb lattices of PbSe and CdSe have shown a rich band structure, with Dirac cones at the s- as well as at the p-bands, in addition to a flat p-band. By controlling the chemical composition of the nanocrystals, lattices with strong spin-orbit coupling can be artificially designed. We show that for HgTe a huge non-trivial gap, of order of 50 meV, opens at the K-points. We calculate the edge states using both, an atomistic calculation that takes into account 106 atomic orbitals per unit cell, as well as an effective 16-bands tight-binding model, and find that the quantum spin Hall effect should be observable in this material at temperatures of the order of room temperature.Show less >

Language :

Anglais

Peer reviewed article :

Oui

Audience :

Internationale

Popular science :

Non

Collections :

• Institut d'Électronique, de Microélectronique et de Nanotechnologie (IEMN) - UMR 8520

Source :

Harvested from HAL