Quantum spin Hall phase in 2D trigonal lattice
Abstract
The quantum spin Hall (QSH) phase is an exotic phenomena in condensed-matter physics. Here we show that a minimal basis of three orbitals (s, px, py) is required to produce a QSH phase via nearest-neighbour hopping in a two-dimensional trigonal lattice. Tight-binding model analyses and calculations show that the QSH phase arises from a spin–orbit coupling (SOC)-induced s–p band inversion or p–p bandgap opening at Brillouin zone centre (Γ point), whose topological phase diagram is mapped out in the parameter space of orbital energy and SOC. Remarkably, based on first-principles calculations, this exact model of QSH phase is shown to be realizable in an experimental system of Au/GaAs(111) surface with an SOC gap of ~73 meV, facilitating the possible room-temperature measurement. Finally, our results will extend the search for substrate supported QSH materials to new lattice and orbital types.
- Authors:
-
- Univ. of Science and Technology of China, Anhui (China); Univ. of Utah, Salt Lake City, UT (United States)
- Univ. of Utah, Salt Lake City, UT (United States)
- Univ. of Utah, Salt Lake City, UT (United States); Collaborative Innovation Center of Quantum Matter, Beijing (China)
- Publication Date:
- Research Org.:
- Univ. of Utah, Salt Lake City, UT (United States)
- Sponsoring Org.:
- USDOE
- OSTI Identifier:
- 1361410
- Grant/Contract Number:
- FG02-04ER46148
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Nature Communications
- Additional Journal Information:
- Journal Volume: 7; Journal ID: ISSN 2041-1723
- Publisher:
- Nature Publishing Group
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 36 MATERIALS SCIENCE; 75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; electronic structure; topological insulators
Citation Formats
Wang, Z. F., Jin, Kyung -Hwan, and Liu, Feng. Quantum spin Hall phase in 2D trigonal lattice. United States: N. p., 2016.
Web. doi:10.1038/ncomms12746.
Wang, Z. F., Jin, Kyung -Hwan, & Liu, Feng. Quantum spin Hall phase in 2D trigonal lattice. United States. https://doi.org/10.1038/ncomms12746
Wang, Z. F., Jin, Kyung -Hwan, and Liu, Feng. Wed .
"Quantum spin Hall phase in 2D trigonal lattice". United States. https://doi.org/10.1038/ncomms12746. https://www.osti.gov/servlets/purl/1361410.
@article{osti_1361410,
title = {Quantum spin Hall phase in 2D trigonal lattice},
author = {Wang, Z. F. and Jin, Kyung -Hwan and Liu, Feng},
abstractNote = {The quantum spin Hall (QSH) phase is an exotic phenomena in condensed-matter physics. Here we show that a minimal basis of three orbitals (s, px, py) is required to produce a QSH phase via nearest-neighbour hopping in a two-dimensional trigonal lattice. Tight-binding model analyses and calculations show that the QSH phase arises from a spin–orbit coupling (SOC)-induced s–p band inversion or p–p bandgap opening at Brillouin zone centre (Γ point), whose topological phase diagram is mapped out in the parameter space of orbital energy and SOC. Remarkably, based on first-principles calculations, this exact model of QSH phase is shown to be realizable in an experimental system of Au/GaAs(111) surface with an SOC gap of ~73 meV, facilitating the possible room-temperature measurement. Finally, our results will extend the search for substrate supported QSH materials to new lattice and orbital types.},
doi = {10.1038/ncomms12746},
journal = {Nature Communications},
number = ,
volume = 7,
place = {United States},
year = {Wed Sep 07 00:00:00 EDT 2016},
month = {Wed Sep 07 00:00:00 EDT 2016}
}
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