Quasiparticle origin of dynamical quantum phase transitions
Jad C. Halimeh, Maarten Van Damme, Valentin Zauner-Stauber, Laurens Vanderstraeten
Abstract
This paper establishes a direct connection between the equilibrium quasiparticle spectrum of a model and the nonanalytic behavior appearing in its Loschmidt return rate. For small quenches within the ordered phase, nonanalytic behavior in the form of so-called anomalous cusps occurs in the return rate only when the lowest-lying quasiparticles are local excitations.
Topics & Concepts
QuasiparticlePhysicsCondensed matter physicsConnection (principal bundle)Spectrum (functional analysis)Quantum mechanicsPhase (matter)Phase transitionQuantumQuantum phasesQuantum phase transitionQuantum electrodynamicsQuantum many-body systemsTopological Materials and PhenomenaCold Atom Physics and Bose-Einstein Condensates