Stuttgart 2012 – scientific programme
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Q: Fachverband Quantenoptik und Photonik
Q 21: Quantengase: Optische Gitter 1
Q 21.8: Talk
Tuesday, March 13, 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)