Time-dependent spin-wave theory

Details Time-dependent spin-wave theory Time-dependent spin-wave theory

2011-11-08

arxiv.org/abs/1111.2052v2

Phys. Rev. B, 85, 054422 (2012)

Physics

Condensed Matter

Strongly Correlated Electrons

6 pages, 5 figures, final version published in PRB

Scientific paper

10.1103/PhysRevB.85.054422

We generalize the spin-wave expansion in powers of the inverse spin to time-dependent quantum spin models describing rotating magnets or magnets in time-dependent external fields. We show that in these cases, the spin operators should be projected onto properly defined rotating reference frames before the spin components are bosonized using the Holstein-Primakoff transformation. As a first application of our approach, we calculate the reorganization of the magnetic state due to Bose-Einstein condensation of magnons in the magnetic insulator yttrium-iron garnet; we predict a characteristic dip in the magnetization which should be measurable in experiments.

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