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Large-gap quantum spin Hall insulators in tin films.

Yong Xu1, Binghai Yan, Hai-Jun Zhang

  • 1Department of Physics, McCullough Building, Stanford University, Stanford, California 94305-4045, USA and Institute for Advanced Study, Tsinghua University, Beijing 100084, People's Republic of China.

Physical Review Letters
|October 15, 2013
PubMed
Summary

Two-dimensional tin films are identified as quantum spin Hall (QSH) insulators with large, room-temperature-applicable bulk gaps. Their QSH states are tunable via chemical modification and strain, with potential for the quantum anomalous Hall effect.

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Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Topological Materials

Background:

  • Quantum spin Hall (QSH) insulators are crucial for spintronics and topological quantum computing.
  • Discovering large-gap QSH insulators operable at room temperature remains a significant challenge.

Purpose of the Study:

  • To identify novel two-dimensional materials exhibiting the QSH effect.
  • To explore methods for tuning the QSH states in these materials.

Main Methods:

  • First-principles calculations were employed to investigate the electronic properties of two-dimensional tin films.
  • Band structure analysis was performed to identify the mechanism of the QSH effect.

Main Results:

  • Two-dimensional tin films were predicted to be QSH insulators with a substantial bulk gap of 0.3 eV.
  • The QSH states in tin films can be tuned through chemical functionalization and external strain.
  • Band inversion at the Γ point was identified as the mechanism for the QSH effect, analogous to HgTe quantum wells.

Conclusions:

  • Two-dimensional tin films represent promising candidates for practical QSH applications at room temperature.
  • Chemical functionalization and strain offer effective routes to control QSH properties.
  • Surface doping with magnetic elements could enable the realization of the quantum anomalous Hall effect.