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Title: Quantum spin Hall phase in 2D trigonal lattice

Journal Article · · Nature Communications
DOI:https://doi.org/10.1038/ncomms12746· OSTI ID:1361410
 [1];  [2];  [3]
  1. Univ. of Science and Technology of China, Anhui (China); Univ. of Utah, Salt Lake City, UT (United States)
  2. Univ. of Utah, Salt Lake City, UT (United States)
  3. Univ. of Utah, Salt Lake City, UT (United States); Collaborative Innovation Center of Quantum Matter, Beijing (China)

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.

Research Organization:
Univ. of Utah, Salt Lake City, UT (United States)
Sponsoring Organization:
USDOE
Grant/Contract Number:
FG02-04ER46148
OSTI ID:
1361410
Journal Information:
Nature Communications, Vol. 7; ISSN 2041-1723
Publisher:
Nature Publishing GroupCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 34 works
Citation information provided by
Web of Science

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Cited By (16)

Quantum Spin Hall Materials journal July 2019
Computational design of two-dimensional topological materials: Two-dimensional topological materials journal March 2017
Formation of a large gap quantum spin Hall phase in a 2D trigonal lattice with three p-orbitals journal January 2018
Oxygen-functionalized TlTe buckled honeycomb from first-principles study journal January 2019
Fully spin-polarized quadratic non-Dirac bands realized quantum anomalous Hall effect journal January 2020
Topological phase transition induced by p x,y and p z band inversion in a honeycomb lattice journal January 2019
Orbital design of topological insulators from two-dimensional semiconductors journal January 2019
Robust large gap quantum spin Hall insulators in methyl and ethynyl functionalized TlSb buckled honeycombs journal July 2018
Prediction of intrinsic two-dimensional non-Dirac topological insulators in triangular metal-organic frameworks journal January 2019
Surface alloy engineering in 2D trigonal lattice: giant Rashba spin splitting and two large topological gaps journal February 2018
Comparison of quantum spin Hall states in quasicrystals and crystals journal August 2019
Kagome bands disguised in a coloring-triangle lattice journal March 2019
Quantum Spin Hall Effect and Spin Bott Index in a Quasicrystal Lattice journal September 2018
Hourglass Fermion in Two-Dimensional Material journal September 2019
Quantum Spin Hall Effect and Spin Bott Index in a Quasicrystal Lattice text January 2018
Fully spin-polarized quadratic non-Dirac bands realized quantum anomalous Hall effect text January 2019