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  Magnon frequency renormalization by the electronic geometrical spin torque in itinerant magnets

Viñas Boström, E., Eich, F. G., & Rubio, A. (2021). Magnon frequency renormalization by the electronic geometrical spin torque in itinerant magnets.

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2112.06547.pdf (Preprint), 2MB
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2112.06547.pdf
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2021
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https://arxiv.org/abs/2112.06547 (Preprint)
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 Creators:
Viñas Boström, E.1, Author              
Eich, F. G.1, 2, Author              
Rubio, A.1, 3, Author              
Affiliations:
1Theory Group, Theory Department, Max Planck Institute for the Structure and Dynamics of Matter, Max Planck Society, ou_2266715              
2HQS Quantum Simulations GmbH, ou_persistent22              
3Center for Computational Quantum Physics (CCQ), Flatiron Institute, ou_persistent22              

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Free keywords: Condensed Matter, Materials Science, cond-mat.mtrl-sci
 Abstract: We investigate non-adiabatic effects on the magnon frequency in an interacting system of localized spins and itinerant electrons. Including the lowest order corrections to the adiabatic dynamics in an analytically solvable model, applicable to simple ferromagnets like Fe, Co and Ni, we find that the magnon frequency is renormalized by a geometrical torque arising from the electronic spin Berry curvature. Comparison to exact numerical simulations reveals that our analytical solution captures essential low-energy features, and provides a mechanism for the magnon frequency hardening observed in recent first principles calculations for Fe, provided the geometrical torque is taken into account.

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Language(s): eng - English
 Dates: 2021-12-13
 Publication Status: Published online
 Pages: 6
 Publishing info: -
 Table of Contents: -
 Rev. Type: No review
 Identifiers: arXiv: 2112.06547
 Degree: -

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