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Advanced Experimental Methods for Low-temperature Magnetotransport Measurement of Novel Materials
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Quantum spin Hall phase in 2D trigonal lattice.

Z F Wang1,2, Kyung-Hwan Jin2, Feng Liu2,3

  • 1Hefei National Laboratory for Physical Sciences at the Microscale, Synergetic Innovation Center of Quantum Information and Quantum Physics, University of Science and Technology of China, Hefei, Anhui 230026, China.

Nature Communications
|September 8, 2016
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Summary
This summary is machine-generated.

Researchers discovered that a minimal three-orbital basis (s, px, py) is essential for achieving the quantum spin Hall (QSH) phase in a specific lattice. This finding, realizable in Au/GaAs(111), opens new avenues for QSH material exploration.

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Area of Science:

  • Condensed-matter physics
  • Materials science
  • Topological materials

Background:

  • The quantum spin Hall (QSH) phase is a significant topological state in condensed-matter physics.
  • Understanding the minimal requirements for realizing QSH phases is crucial for material design.
  • Previous studies have explored various systems, but novel lattice and orbital configurations are sought.

Purpose of the Study:

  • To determine the minimal orbital basis required for a QSH phase in a trigonal lattice.
  • To investigate the role of spin-orbit coupling (SOC) in inducing the QSH phase.
  • To identify a realistic experimental system for realizing the proposed QSH phase.

Main Methods:

  • Development and analysis of a tight-binding model with nearest-neighbor hopping.
  • Inclusion of spin-orbit coupling (SOC) effects in the model.
  • First-principles calculations to verify the model's predictions in a specific material system.

Main Results:

  • A minimal basis of three orbitals (s, px, py) is identified as necessary for the QSH phase.
  • The QSH phase arises from SOC-induced s-p band inversion or p-p bandgap opening at the Γ point.
  • The proposed QSH phase is predicted to be experimentally realizable in Au/GaAs(111) with a significant SOC gap (∼73 meV).

Conclusions:

  • The study establishes a minimal orbital requirement for QSH phase realization in a trigonal lattice.
  • The findings provide a pathway for designing new substrate-supported QSH materials.
  • The proposed Au/GaAs(111) system offers potential for room-temperature QSH measurements.