2014/03/31 by Markus Heyl · 2 citations
Physics and Astronomy · #Cold Atom Physics and Bose-Einstein Condensates #Condensed matter physics #Phase (matter) #Phase transition #Physics #Quantum #Quantum critical point #Quantum many-body systems #Quantum mechanics #Quantum phase transition #Quantum phases #Strong Light-Matter Interactions #Symmetry (geometry) #cond-mat.stat-mech #quant-ph
paper · pdf · doi:10.1103/physrevlett.113.205701
published as Phys. Rev. Lett. 113, 205701 (2014) · 4 pages, 3 figures, updated references
openalex publication_date 2014/11/14 · arxiv created 2014/11/21 · arxiv updated 2014/11/24 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05
In this Letter it is shown that dynamical quantum phase transitions in Loschmidt echos control the nonequilibrium dynamics of the order parameter after particular quantum quenches in systems with broken-symmetry phases. A direct connection between Loschmidt echos and the order parameter dynamics is established which links nonequilibrium microscopic probabilities to the system's macroscopic dynamical properties. These concepts are illustrated numerically using exact diagonalization for quantum quenches in the XXZ chain with initial Néel states. An outlook is given on how to explore these predictions experimentally with ultracold gases in optical lattices.