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Room-temperature quantum spin Hall effect in HgTe honeycomb superlattices

Abstract : 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.
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https://hal.archives-ouvertes.fr/hal-00922589
Contributor : Collection Iemn <>
Submitted on : Saturday, December 28, 2013 - 3:45:47 PM
Last modification on : Wednesday, April 7, 2021 - 10:32:03 AM

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  • HAL Id : hal-00922589, version 1

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Cristiane Morais Smith, Wouter Beugeling, Efterpi Kalesaki, Yann-Michel Niquet, Christophe Delerue, et al.. Room-temperature quantum spin Hall effect in HgTe honeycomb superlattices. American Physical Society March Meeting, APS March Meeting 2014, Session B31 - Focus Session : Computational Discovery and Design of New Materials II, 2014, Denver, CO, United States. ⟨hal-00922589⟩

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