Regensburg 2019 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 4: Nonequilibrium Quantum Many-Body Systems 1 (joint session TT/DY)

TT 4.1: Vortrag

Montag, 1. April 2019, 09:30–09:45, H22

Quantum Loschmidt echo in quenched Hubbard model — •Nikodem Szpak¹ and Ralf Schützhold^2,3 — ¹Fakultät für Physik, Universität Duisburg-Essen — ²Helmholtz-Zentrum Dresden-Rossendorf — ³Institut für Theoretische Physik, Technische Universität Dresden

A quantum Loschmidt echo (also referred to as quantum time mirror) corresponds to an effective time inversion after which the quantum wave function reverses its previous time evolution and eventually reaches its initial distribution again. We consider a Hubbard model describing free dispersion in a lattice and impose a sudden pulse-like perturbation (pi-pulse) which reverses the sign of all quasi-momenta simultaneously. After equal period of time, we observe the rebuild of the initial state. We generalize previous results obtained in this field and propose a comparably simple protocol for ultra-cold atoms in optical lattices which should be easier to realize experimentally than previous proposals.