Erlangen 2018 – wissenschaftliches Programm
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A: Fachverband Atomphysik
A 42: Poster Session IIIb
A 42.9: Poster
Donnerstag, 8. März 2018, 16:15–18:15, Zelt Ost
Bosonic quantum dynamics following a linear interaction quench in finite optical lattices of unit filling — •Simeon Mistakidis1, Georgios Koutentakis1,2, and Peter Schmelcher1,2 — 1Zentrum für optische Quantentechnologien Luruper Chaussee 149 22761 Hamburg — 2he Hamburg Centre for Ultrafast Imaging, Universitat Hamburg, Luruper Chaussee 149, 22761 Hamburg, Germany
The nonequilibrium ultracold bosonic quantum dynamics in finite optical lattices of unit filling following a linear interaction quench from a superfluid to a Mott insulator state and vice versa is investigated. The resulting dynamical response consists of various inter and intraband tunneling modes. We find that the competition between the quench rate and the interparticle repulsion leads to a resonant dynamical response, at moderate ramp times, being related to avoided crossings in the many-body eigenspectrum with varying interaction strength. Crossing the regime of weak to strong interactions several transport pathways are excited. The higher-band excitation dynamics is shown to obey an exponential decay possessing two distinct time scales with varying ramp time. Studying the crossover from shallow to deep lattices we find that for a diabatic quench the excited band fraction decreases, while approaching the adiabatic limit it exhibits a non-linear behavior for increasing height of the potential barrier. The inverse ramping process from strong to weak interactions leads to a melting of the Mott insulator and possesses negligible higher-band excitations which follow an exponential decay for decreasing quench rate.