Universal Berezinskii-Kosterlitz-Thouless dynamic scaling in the intermediate time range in frustrated Heisenberg antiferromagnets on a triangular lattice

作者：Popov Ivan S^*; Prudnikov Pavel V; Ignatenko Andrey N; Katanin Andrey A

来源：PHYSICAL REVIEW B, 2017, 95(13): 134437.

DOI：10.1103/PhysRevB.95.134437

We investigate nonequilibrium properties of the frustrated Heisenberg antiferromagnets on the triangular lattice. Nonequilibrium critical relaxation of frustrated Heisenberg antiferromagnets shows a dynamic transition (or, at least, sharp crossover) near the temperature T-u = 0.282J of the equilibrium Z(2)-vortex unbinding. We show that starting from the high-temperature initial state, due to the presence of Z(2) vortices in the system being considered, in a broad temperature range T < T-u the dynamic properties in the intermediate time range are similar to those of the two-dimensional XY model below the Berezinskii-Kosterlitz-Thouless transition. The interaction of Z(2) vortices with spin-wave degrees of freedom does not emerge until rather long times.

• 出版日期2017-4-21