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Atomically Thin Quantum Spin Hall Insulators.

Michael S Lodge1, Shengyuan A Yang2, Shantanu Mukherjee3,4,5

  • 1School of Physical and Mathematical Sciences, Nanyang Technological University, Singapore, 637371, Singapore.

Advanced Materials (Deerfield Beach, Fla.)
|April 24, 2021
PubMed
Summary
This summary is machine-generated.

Atomically thin quantum spin Hall (QSH) insulators offer tunable 800 meV bandgaps and unique edge states for next-generation electronics. Research explores their potential for Majorana-based topological quantum computing.

Keywords:
2D topological insulatorsMajorana fermionshelical Tomonaga-Luttinger liquidsquantum spin-Hall effecttopological superconductivity

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Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Quantum Computing

Background:

  • Atomically thin topological materials are revolutionizing electronic device concepts.
  • Quantum spin Hall (QSH) insulators are 2D states of matter with tunable bandgaps up to 800 meV and gapless 1D edge states.
  • These properties arise from topological band inversion and strong spin-orbit coupling.

Purpose of the Study:

  • To survey recent advances in QSH materials science and engineering.
  • To focus on the prospects for QSH-based device applications.
  • To discuss theoretical predictions for Majorana-based topological quantum computing using QSH states.

Main Methods:

  • Review of recent advances in materials science and engineering.
  • Theoretical description of QSH insulator properties.
  • Survey of the QSH materials library.
  • Analysis of theoretical predictions for superconducting pairing.

Main Results:

  • QSH insulators possess large, tunable bulk bandgaps (up to 800 meV).
  • They exhibit gapless, 1D edge states crucial for exotic electronic properties.
  • Theoretical predictions suggest potential for nontrivial superconducting pairing.

Conclusions:

  • QSH materials hold significant promise for transforming classical and quantum electronics.
  • Further research into QSH states is critical for realizing Majorana-based topological quantum computing.
  • The QSH materials library is expanding, paving the way for novel device applications.