Loschmidt-amplitude wave function spectroscopy and the physics of dynamically driven phase transitions
arXiv:1809.00733 · doi:10.1103/PhysRevB.101.081106
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.
4.5 pages + SM, 5 + 3 figures, accepted version