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Nonlinear Topological Magnon Spin Hall Effect.

Zhejunyu Jin1, Xianglong Yao1, Zhenyu Wang1

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Researchers discovered hidden gauge fields in nonlinear magnon transport. This nonlinear topological magnon spin Hall effect reveals new ways to probe magnetic textures and gauge fields.

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Area of Science:

  • Condensed Matter Physics
  • Spintronics
  • Quantum Magnonics

Background:

  • Magnons interacting with 2D magnetic textures experience fictitious magnetic fields from gauge fields.
  • Only one component of these gauge fields has been experimentally observed to influence magnon behavior.
  • Two other gauge field components remain hidden in current magnon transport studies.

Purpose of the Study:

  • To reveal the role of the hidden gauge field components in magnon transport.
  • To theoretically investigate nonlinear magnon-skyrmion interactions in antiferromagnetic textures.
  • To explore a novel nonlinear topological magnon spin Hall effect.

Main Methods:

  • Theoretical analysis of nonlinear magnon-skyrmion scattering in antiferromagnets.
  • Focus on three-magnon processes involving circularly polarized magnons and breathing skyrmions.
  • Investigation of scattering features to predict observable phenomena.

Main Results:

  • Demonstrated that hidden gauge fields manifest in nonlinear magnon transport.
  • Predicted a significant Hall angle in both confluence and splitting modes of magnon scattering.
  • Observed a sign reversal of the Hall angle by altering the magnon's handedness.

Conclusions:

  • The nonlinear topological magnon spin Hall effect is a consequence of the bosonic nature of magnons.
  • This effect offers a new nonlinear method for probing gauge fields.
  • Findings have no direct counterpart in fermionic systems and open new research avenues.