Universal decay of spin spiral order in the Heisenberg model
Joaquin F. Rodriguez-Nieva (Stanford)
Characterizing the mechanisms responsible for the breakdown of phase coherence in quantum systems is a fundamental problem with broad implications in quantum science and technology. In this talk, I describe the mechanisms of dephasing and relaxation of spin spirals in the Heisenberg model. In the first part of my talk, I will discuss a novel mechanism that hinders the formation of long-range coherence in systems with SU(2) symmetry that goes beyond the Landau instability paradigm. In the second part of my talk, I focus on the incoherent prethermal regime and show that such regime is reminiscent of turbulence in classical fluids. Throughout my talk, I will emphasize the important role of symmetries in determining the universal aspects of thermalization. These theoretical predictions for dephasing and prethermalization can be readily tested in pump-probe experiments in ferromagnetic insulators and in quench experiments in optical lattices.
 JFRN, Schuckert, Sels, Knap, Demler, arXiv:2011.0705
 JFRN, arxiv: 2009.11883