Universal spin wave damping in magnetic Weyl semimetals

Journal Article · 11 July 2021 · Physical Review. B

DOI: https://doi.org/10.1103/physrevb.104.024414 · OSTI ID:1853092

Nikolić, Predrag  ^[1]

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1. George Mason Univ., Fairfax, VA (United States); Johns Hopkins Univ., Baltimore, MD (United States); OSTI

We analyze the decay of spin waves into Stoner excitations in magnetic Weyl semimetals. The lifetime of a mode is found to have a universal dependence on its frequency and momentum, and on a few parameters that characterize the relativistic Weyl spectrum. At the same time, uniform Gilbert damping by Weyl electrons is absent. Here, the decay rate of spin waves is calculated perturbatively using the s-d model of itinerant Weyl or Dirac electrons coupled to local moments. We show that many details of the Weyl spectrum, such as the momentum-space locations, dispersions, and sizes of the Weyl Fermi pockets, can be deduced indirectly by probing the spin waves of local moments using inelastic neutron scattering.

• Research Organization: Johns Hopkins Univ., Baltimore, MD (United States)
• Sponsoring Organization: USDOE Office of Science (SC), Basic Energy Sciences (BES)
• Grant/Contract Number: SC0019331
• OSTI ID: 1853092
• Journal Information: Physical Review. B, Journal Name: Physical Review. B Journal Issue: 2 Vol. 104; ISSN 2469-9950
• Publisher: American Physical Society (APS)Copyright Statement
• Country of Publication: United States
• Language: English