Quantum Quench of the "Speed of Light": Quantum Dynamical Universality Classes and Short-time Universal Behavior

Mohammad F. Maghrebi

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arXiv · 1709.04463

Quantum Quench of the "Speed of Light": Quantum Dynamical Universality Classes and Short-time Universal Behavior

Mohammad F. Maghrebi

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Abstract

A long-lived prethermal state may emerge upon a sudden quench of a quantum system. In this paper, we study a quantum quench of an initial {\it critical} state, and show that the resulting prethermal state exhibits a genuinely quantum and dynamical universal behavior. Specifically, we consider a scenario where the "speed of light" characterizing the propagation of local perturbations is suddenly quenched at criticality. We also find that the system approaches the prethermal state in a universal way described by a new exponent that characterizes a kind of quantum aging.

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Mohammad F. Maghrebi. 2017-09-13. Quantum Quench of the "Speed of Light": Quantum Dynamical Universality Classes and Short-time Universal Behavior. https://arxiv.org/abs/1709.04463

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