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- Title
Larmor precession in strongly correlated itinerant electron systems.
- Authors
van Loon, Erik G. C. P.; Strand, Hugo U. R.
- Abstract
Many-electron systems undergo a collective Larmor precession in the presence of a magnetic field. In a paramagnetic metal, the resulting spin wave provides insight into the correlation effects generated by the electron-electron interaction. Here, we use dynamical mean-field theory to investigate the collective Larmor precession in the strongly correlated regime, where dynamical correlation effects such as quasiparticle lifetimes and non-quasiparticle states are essential. We study the spin excitation spectrum, which includes a dispersive Larmor mode as well as electron-hole excitations that lead to Stoner damping. We also extract the momentum-resolved damping of slow spin waves. The accurate theoretical description of these phenomena relies on the Ward identity, which guarantees a precise cancellation of self-energy and vertex corrections at long wavelengths. Our findings pave the way towards a better understanding of spin wave damping in correlated materials. The authors provide an application of dynamical mean-field theory to the spin dynamics in strongly correlated electron systems showing the impact of dynamic electron-electron self-energies and vertex functions on the Larmor mode and damping processes. The results show the superior nature of the methodology against simpler random-phase approximation techniques.
- Subjects
LARMOR precession; SPIN waves; ELECTRON-electron interactions; EXCITATION spectrum; MEAN field theory; MAGNETIC fields
- Publication
Communications Physics, 2023, Vol 6, Issue 1, p1
- ISSN
2399-3650
- Publication type
Article
- DOI
10.1038/s42005-023-01411-w