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Inversion-Protected Higher-Order Topological Superconductivity in Monolayer WTe_{2}.

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Superconducting monolayer WTe2 hosts Majorana corner modes in both spin-triplet and unconventional equal-spin pairing phases. This discovery opens avenues for higher-order topological superconductivity and novel Majorana modes in 2D materials.

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Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Quantum Phenomena

Background:

  • Monolayer WTe2 is a quantum spin Hall insulator and becomes superconducting when gated.
  • Understanding the pairing symmetry and topological properties of superconducting WTe2 is crucial.

Purpose of the Study:

  • To investigate the pairing symmetry and topological nature of superconducting WTe2 using a microscopic model.
  • To explore the conditions for hosting Majorana modes in this material.

Main Methods:

  • Mean-field theoretical modeling of superconducting WTe2.
  • Phase diagram analysis to identify different superconducting states.
  • Investigation of topological properties and Majorana mode localization.

Main Results:

  • Spin-triplet superconducting phases host Majorana modes at opposite corners.
  • An in-plane magnetic field stabilizes an unconventional equal-spin pairing with Majorana corner modes.
  • A general recipe for higher-order topological superconductors with Majorana corner modes is proposed.

Conclusions:

  • Superconducting monolayer WTe2 exhibits higher-order topological superconductivity.
  • It may be the first material realization of inversion-protected Majorana corner modes without proximity effects.
  • The study provides experimental guidance for probing these Majorana modes.