Browsing by Author "De Vega, Ines"

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    Prethermalization and persistent order in the absence of a thermal phase transition
    (American Physical Society, 2017) Halimeh, Jad C.; Zauner-Stauber, Valentin; McCulloch, Ian P.; De Vega, Ines; Schollwock, Ulrich; Kastner, Michael
    We numerically study the dynamics after a parameter quench in the one-dimensional transverse-field Ising model with long-range interactions (∝1/rα with distance r), for finite chains and also directly in the thermodynamic limit. In nonequilibrium, i.e., before the system settles into a thermal state, we find a long-lived regime that is characterized by a prethermal value of the magnetization, which in general differs from its thermal value. We find that the ferromagnetic phase is stabilized dynamically: as a function of the quench parameter, the prethermal magnetization shows a transition between a symmetry-broken and a symmetric phase, even for those values of α for which no finite-temperature transition occurs in equilibrium. The dynamical critical point is shifted with respect to the equilibrium one, and the shift is found to depend on α as well as on the quench parameters.