Hydrodynamical phase transition for domain-wall melting in the XY chain
Viktor EislerInstitut für Theoretische Physik, Technische Universität Graz, Petersgasse 16, A-8010 Graz, AustriaFlorian MaislingerInstitut für Theoretische Physik, Technische Universität Graz, Petersgasse 16, A-8010 Graz, Austria
2018en
ABI
Abstract
We study the melting of a domain wall, prepared as a certain low-energy excitation above the ferromagnetic ground state of the XY chain. In a well-defined parameter regime the time-evolved magnetization profile develops sharp kinklike structures in the bulk, showing features of a phase transition in the hydrodynamic scaling limit. The transition is of a purely dynamical nature and can be attributed to the appearance of a negative effective mass term in the dispersion. The signatures are also clearly visible in the entanglement profile measured along the front region, which can be obtained by covariance-matrix methods despite the state being non-Gaussian.
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