2014/09/30 by Pietro Smacchia, Michael Knap, Eugene Demler +1 · 3 citations
Physics and Astronomy · #Cold Atom Physics and Bose-Einstein Condensates #Criticality #Dynamical systems theory #Noise (video) #Opinion Dynamics and Social Influence #Phase (matter) #Phase transition #Physics #Quantum #Quantum many-body systems #Quantum mechanics #Quantum phase transition #Spin (aerodynamics) #Statistical physics #cond-mat.quant-gas #cond-mat.stat-mech
paper · pdf · doi:10.1103/physrevb.91.205136
published as Phys. Rev. B 91, 205136 (2015) · 10 pages; 10 figures
arxiv created 2015/05/04 · openalex publication_date 2015/05/26 · arxiv updated 2015/06/03 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05
Dynamical phase transitions can occur in isolated quantum systems that are brought out of equilibrium by sudden parameter changes. We discuss the characterization of such dynamical phase transitions based on the statistics of produced excitations. We consider both the O(N) model in the large-N limit and a spin model with long-range interactions and show that the dynamical criticality of their prethermal steady states manifests most dramatically not in the average number of excitations but in their higher moments. We argue that the growth of defect fluctuations carries unique signatures of the dynamical criticality, irrespective of the precise details of the model. Our theoretical results should be relevant to quantum quench experiments with ultracold bosonic atoms in optical lattices.