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Spin-Selective Second-Order Topological Insulators Enabling Cornertronics in Two-Dimensional Altermagnets.

Ning-Jing Yang1, Zhigao Huang1, Jian-Min Zhang1

  • 1Fujian Provincial Key Laboratory of Quantum Manipulation and New Energy Materials, College of Physics and Energy, Fujian Normal University, Fuzhou 350117, China.

Nano Letters
|October 20, 2025
PubMed
Summary
This summary is machine-generated.

Altermagnets (AMs) enable new electronic devices. We discovered a spin-corner locking mechanism creating unique topological states in 2D altermagnetic systems, paving the way for advanced spintronics and higher-order topology applications.

Keywords:
altermagneticcornertronicssecond-order topological insulatorspintronicstopological phase transition

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Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Spintronics

Background:

  • Altermagnets (AMs) represent a novel class of magnetic materials with unique spin properties.
  • Spintronics aims to utilize electron spin for next-generation electronic devices.
  • Higher-order topological insulators exhibit unique boundary states.

Purpose of the Study:

  • To establish a spin-corner locking mechanism in 2D altermagnetic systems.
  • To investigate the generation of second-order topological states under strain.
  • To identify viable material candidates for these topological states.

Main Methods:

  • Effective model analysis to establish the spin-corner locking mechanism.
  • First-principles calculations to identify material candidates.
  • Uniaxial strain application to induce topological phase transitions.

Main Results:

  • A spin-corner locking mechanism generating second-order topological states was established.
  • Uniaxial strain breaks Mxy symmetry, creating spin-resolved corner modes and a corner-polarized second-order topological insulator (CPSOTI).
  • CrO and Cr2Se2O were identified as robust 2D intrinsic AM CPSOTI candidates, with CrO also hosting an altermagnetic Weyl semimetal phase.

Conclusions:

  • The findings introduce a novel mechanism for generating higher-order topological states in altermagnets.
  • This research opens avenues for coupling topological spintronics with cornertronics.
  • The identified materials provide experimental platforms for realizing these advanced topological phenomena.