Universality in the relaxation of spin helices under XXZ spin-chain dynamicsPopkov, Vladislav (Avtor) Žnidarič, Marko (Avtor) Zhang, Xin (Avtor) statistical physicscondensed matter physicsspin chainshelicoidal magnetic texturespin dynamics1-dimensional spin chainsquantum spin modelsHeisenberg modelthermodynamicscondensed mattermaterialsapplied physicsWe describe the dynamics of a transverse spin-helix state—a product state with spatially rotating magnetization—under XXZ spin chain evolution. Due to experimental relevance we especially focus on magnetization dynamics. At long times the $U$(1) symmetry of the Hamiltonian is restored, leading to the decay of transverse magnetization, which can be described as an exponential decay of a spatially harmonic profile. We show that the dependence of the short- and intermediate-time decay timescale, which in principle depends on all different parameters, like the wave vector of the initial helix, the anisotropy, etc., can be described well by a single scaling function. We also briefly discuss the evolution of magnetization current.20232024-03-18 13:06:21Članek v reviji155057UDK: 536.93ISSN pri članku: 2469-9950DOI: 10.1103/PhysRevB.107.235408COBISS_ID: 188718851sl