Loschmidt-amplitude wave function spectroscopy and the physics of dynamically driven phase transitions
Dante M. Kennes, Christoph Karrasch, Andrew J. Millis
Abstract
We introduce the Loschmidt amplitude as a powerful tool to perform spectroscopy of generic many-body wave functions and use it to interrogate the wave function obtained after ramping the transverse field quantum Ising model through its quantum critical point. Previous results are confirmed and a more complete understanding of the population of defects and of the effects of magnon-magnon interaction or finite-size corrections is obtained. The influence of quantum coherence is clarified.
Topics & Concepts
PhysicsAmplitudeIsing modelCoherence (philosophical gambling strategy)QuantumWave functionQuantum phase transitionQuantum mechanicsPhase transitionMagnonQuantum critical pointFunction (biology)SpectroscopyPopulationCondensed matter physicsStatistical physicsQuantum electrodynamicsFerromagnetismSociologyEvolutionary biologyBiologyDemographyQuantum many-body systemsPhysics of Superconductivity and MagnetismQuantum and electron transport phenomena