Berlin 2014 – wissenschaftliches Programm

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Q: Fachverband Quantenoptik und Photonik

Q 49: Quantum gases: Lattices I

Q 49.2: Vortrag

Donnerstag, 20. März 2014, 16:45–17:00, UDL HS2002

Expansion dynamics of ultracold Bosons in a one-dimensional optical lattice — •Bodhaditya Santra, Ralf Labouvie, Simon Heun, and Herwig Ott — Research Center OPTIMAS and Fachbereich Physik, Technische Universität Kaiserslautern, 67663 Kaiserslautern, Germany

We experimentally investigate the expansion dynamics of ultracold bosons in a one-dimensional (1D) optical lattice. In our experiment, we prepare a 1D optical lattice with high atom occupancy per lattice site. All the atoms from a central lattice site are removed by a focused electron beam. While the atoms from neighboring sites tunnel into the empty site, the 2D density profiles are measured during the filling-up. We determine the temperature T and the chemical potential μ by fitting the 2D density profile with Hartree-Fock mean-field theory. At the beginning of refilling we observe a higher T and lower μ. As the atom number increases with time, T and μ approaches that of the equilibrium state.