Thermal quench dynamics of visons in gapless Kitaev spin liquid
Understanding the nonequilibrium relaxation dynamics of quantum spin liquids is an important and relatively unexplored frontier, where fractionalized quasiparticles and emergent gauge fields can give rise to dynamical behaviors far beyond those of conventional magnets. Here we study the relaxation dynamics of the Kitaev honeycomb model following a thermal quench, focusing on visons—gapped $${{\mathbb{Z}}}_{2}$$ flux excitations of the emergent gauge field in the Kitaev spin l
Researchers have investigated the relaxation processes in a Kitaev spin liquid following a rapid temperature change, specifically examining the behavior of "vison" excitations. These excitations, which are related to the emergent gauge fields in this exotic magnetic state, govern the system's long-term evolution through diffusion and pair annihilation. The study reveals that the movement and interactions of these visons are influenced by underlying Majorana fermions and are subject to an activation barrier. The dynamics exhibit distinct temperature-dependent behaviors, transitioning from diffusion-driven annihilation at higher temperatures to a state of "dynamical arrest" as the temperature decreases. This arrest is linked to the formation of temporary, ordered structures of visons that hinder their further annihilation.
This research sheds light on the complex, out-of-equilibrium behavior of quantum spin liquids, which could lead to new insights into exotic states of matter and their potential applications.
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