Nonequilibrium Statistical Mechanics of Noninteracting Classical Spins in a Rotating Magnetic Field

다국어 초록 (Multilingual Abstract)

A model of noninteracting classical spins in a time-dependent rotating magnetic field is investigated. The nonequilibrium magnetization, equal-time correlation functions, time-displaced correlation functions, and the energy are calculated to see their dependences on the magnitude of a transverse rotating magnetic field and a rotating angular frequency. For small rotating fields, compared to a static field along the $z$-axis, all the nonequilibrium quantities show remarkable increases in the oscillation amplitudes at the resonance frequency.
However, due to the competition between the static field and the rotating field, the oscillation amplitude increases monotonically for large rotating fields as we increase the angular frequency beyond the resonance angular frequency and no resonance phenomena are seen.

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