Abstract
Several mean-field computations have revealed the existence of an out-of-equilibrium dynamical transition induced by quantum-quenching an isolated system starting from its symmetry-broken phase. In this work we focus on the quantum -component field theory. By taking into account dynamical fluctuations at the Hartree-Fock level, corresponding to the leading order of the expansion, we derive the critical properties of the dynamical transition beyond mean-field theory (including at finite temperature). We find diverging time and length scales, dynamic scaling, and aging. Finally, we unveil a relationship with critical coarsening, an off-equilibrium regime that can be induced by quenching from the symmetric toward the symmetry-broken phase.
- Received 12 November 2012
DOI:https://doi.org/10.1103/PhysRevB.88.201110
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