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Q: Fachverband Quantenoptik und Photonik

Q 21: Quantengase: Optische Gitter 1

Q 21.8: Vortrag

Dienstag, 13. März 2012, 12:15–12:30, V53.01

Tunneling dynamics of ultracold bosons in tilted optical lattices — •Konstantin Krutitsky¹, Patrick Navez², Friedemann Queisser¹, and Ralf Schützhold¹ — ¹Fakultät für Physik, Universität Duisburg-Essen, Lotharstrasse 1, 47057 Duisburg, Germany — ²Institut für Theoretische Physik, Technische Universität Dresden, 01062 Dresden, Germany

We present the results of our investigation of ultracold bosons in tilted optical lattices by means of exact numerical diagonalization. Starting in the ground state, we calculate the probability for creating a particle-hole excitation in the Mott-insulator phase after the tilt is smoothly switched on and off again. For very short time scales, we obtain dynamical particle-hole creation, and for intermediate time scales, the particle-hole pairs are produced via tunneling in rather good agreement with the analytical predictions. Finally, if the time dependence is very slow (such that the excitations have enough time to propagate through the whole lattice), finite-size effects start to play a role, and eventually, the pair creation probability goes to zero in the adiabatic regime.
References: arXiv:1107.3730v1, Phys. Rev. A 82, 063603 (2010)