Frequency Splitting of Chiral Phonons from Broken Time-Reversal Symmetry in CrI_{3}.
Phys Rev Lett
; 130(8): 086701, 2023 Feb 24.
Article
em En
| MEDLINE
| ID: mdl-36898102
ABSTRACT
Conventional approaches for lattice dynamics based on static interatomic forces do not fully account for the effects of time-reversal-symmetry breaking in magnetic systems. Recent approaches to rectify this involve incorporating the first-order change in forces with atomic velocities under the assumption of adiabatic separation of electronic and nuclear degrees of freedom. In this Letter, we develop a first-principles method to calculate this velocity-force coupling in extended solids and show via the example of ferromagnetic CrI_{3} that, due to the slow dynamics of the spins in the system, the assumption of adiabatic separation can result in large errors for splittings of zone-center chiral modes. We demonstrate that an accurate description of the lattice dynamics requires treating magnons and phonons on the same footing.
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MEDLINE
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En
Ano de publicação:
2023
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Article