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Skyrmion Hall Effect in Altermagnets.

Zhejunyu Jin1, Zhaozhuo Zeng1, Yunshan Cao1

  • 1School of Physics and State Key Laboratory of Electronic Thin Films and Integrated Devices, <a href="https://ror.org/04qr3zq92">University of Electronic Science and Technology of China</a>, Chengdu 610054, China.

Physical Review Letters
|November 22, 2024
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Summary

We predict the skyrmion Hall effect in altermagnets, materials with zero net magnetization. This effect arises from a magnetic quadrupole, challenging previous beliefs about topological charge absence.

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Area of Science:

  • Condensed Matter Physics
  • Spintronics
  • Topological Materials

Background:

  • The skyrmion Hall effect is typically considered absent in antiferromagnets due to vanishing topological charge.
  • Aharonov-Casher theory suggests topological phenomena can occur for neutral particles.

Purpose of the Study:

  • To predict and investigate the skyrmion Hall effect in altermagnets, materials with zero net magnetization and zero topological charge.
  • To explore the role of magnetic quadrupoles in inducing topological effects in neutral quasiparticles.

Main Methods:

  • Theoretical prediction of the skyrmion Hall effect in altermagnets.
  • Analysis of neutral skyrmions manifesting as magnetic quadrupoles.
  • Identification of a hidden gauge field induced by magnetic quadrupoles.

Main Results:

  • Neutral skyrmions in altermagnets exhibit a skyrmion Hall effect driven by spin transfer torque.
  • A sign change in the Hall angle is observed by altering anisotropic exchange couplings.
  • Altermagnetic skyrmion velocity and Hall angle show strong dependence on current direction.

Conclusions:

  • Magnetic quadrupoles play a crucial role in driving the skyrmion Hall effect even with vanishing charge.
  • This work opens avenues for discovering new Hall effects in neutral quasiparticles beyond magnetic skyrmions.