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Topological Properties of Electrons in Honeycomb Lattice with Detuned Hopping Energy

Honeycomb lattice can support electronic states exhibiting Dirac energy dispersion, with graphene as the icon. We propose to derive nontrivial topology by grouping six neighboring sites of honeycomb lattice into hexagons and enhancing the inter-hexagon hopping energies over the intra-hexagon ones. W...

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Detalles Bibliográficos
Autores principales: Wu, Long-Hua, Hu, Xiao
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Nature Publishing Group 2016
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4830962/
https://www.ncbi.nlm.nih.gov/pubmed/27076196
http://dx.doi.org/10.1038/srep24347
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author Wu, Long-Hua
Hu, Xiao
author_facet Wu, Long-Hua
Hu, Xiao
author_sort Wu, Long-Hua
collection PubMed
description Honeycomb lattice can support electronic states exhibiting Dirac energy dispersion, with graphene as the icon. We propose to derive nontrivial topology by grouping six neighboring sites of honeycomb lattice into hexagons and enhancing the inter-hexagon hopping energies over the intra-hexagon ones. We reveal that this manipulation opens a gap in the energy dispersion and drives the system into a topological state. The nontrivial topology is characterized by the [Image: see text] index associated with a pseudo time-reversal symmetry emerging from the C(6) symmetry of the hopping texture, where the angular momentum of orbitals accommodated on the hexagonal “artificial atoms” behaves as the pseudospin. The size of topological gap is proportional to the hopping-energy difference, which can be larger than typical spin-orbit couplings by orders of magnitude and potentially renders topological electronic transports available at high temperatures.
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spelling pubmed-48309622016-04-19 Topological Properties of Electrons in Honeycomb Lattice with Detuned Hopping Energy Wu, Long-Hua Hu, Xiao Sci Rep Article Honeycomb lattice can support electronic states exhibiting Dirac energy dispersion, with graphene as the icon. We propose to derive nontrivial topology by grouping six neighboring sites of honeycomb lattice into hexagons and enhancing the inter-hexagon hopping energies over the intra-hexagon ones. We reveal that this manipulation opens a gap in the energy dispersion and drives the system into a topological state. The nontrivial topology is characterized by the [Image: see text] index associated with a pseudo time-reversal symmetry emerging from the C(6) symmetry of the hopping texture, where the angular momentum of orbitals accommodated on the hexagonal “artificial atoms” behaves as the pseudospin. The size of topological gap is proportional to the hopping-energy difference, which can be larger than typical spin-orbit couplings by orders of magnitude and potentially renders topological electronic transports available at high temperatures. Nature Publishing Group 2016-04-14 /pmc/articles/PMC4830962/ /pubmed/27076196 http://dx.doi.org/10.1038/srep24347 Text en Copyright © 2016, Macmillan Publishers Limited http://creativecommons.org/licenses/by/4.0/ This work is licensed under a Creative Commons Attribution 4.0 International License. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in the credit line; if the material is not included under the Creative Commons license, users will need to obtain permission from the license holder to reproduce the material. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/
spellingShingle Article
Wu, Long-Hua
Hu, Xiao
Topological Properties of Electrons in Honeycomb Lattice with Detuned Hopping Energy
title Topological Properties of Electrons in Honeycomb Lattice with Detuned Hopping Energy
title_full Topological Properties of Electrons in Honeycomb Lattice with Detuned Hopping Energy
title_fullStr Topological Properties of Electrons in Honeycomb Lattice with Detuned Hopping Energy
title_full_unstemmed Topological Properties of Electrons in Honeycomb Lattice with Detuned Hopping Energy
title_short Topological Properties of Electrons in Honeycomb Lattice with Detuned Hopping Energy
title_sort topological properties of electrons in honeycomb lattice with detuned hopping energy
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4830962/
https://www.ncbi.nlm.nih.gov/pubmed/27076196
http://dx.doi.org/10.1038/srep24347
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