title: Stochastic resonance in the two-dimensional q-state clock models.
abstract: We numerically study stochastic resonance in the two-dimensional q-state clock models from q=2 to 7 under a weak oscillating magnetic field. As in the mean-field case, we observe double resonance peaks, but the detailed response strongly depends on the direction of the field modulation for q≥5 where the quasiliquid phase emerges. We explain this behavior in terms of free-energy landscapes on the two-dimensional magnetization plane.
authors.affiliation: Department of Physics, Sungkyunkwan University, Suwon 440-746, Korea.
authors.forename: Hye Jin
authors.initials: HJ
authors.lastname: Park
authors.affiliation: Department of Physics, Pukyong National University, Busan 608-737, Korea.
authors.forename: Seung Ki
authors.initials: SK
authors.lastname: Baek
authors.affiliation: Department of Physics, Sungkyunkwan University, Suwon 440-746, Korea.
authors.forename: Beom Jun
authors.initials: BJ
authors.lastname: Kim