Berlin 2014 – wissenschaftliches Programm
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Q: Fachverband Quantenoptik und Photonik
Q 4: Quantum gases: Fermions
Q 4.4: Vortrag
Montag, 17. März 2014, 11:15–11:30, DO24 Reuter Saal
Relaxation dynamics of a Fermi gas in an optical superlattice — •Ameneh Sheikhan1, Corinna Kollath1, Johanna Bohn2,3, Daniel Pertot2,3, Marco Koschorreck2,3, Eugenio Cocchi2,3, Luke Miller2,3, and Michael Koehl2,3 — 1HISKP, University of Bonn, Nussallee 14-16, D-53115 Bonn, Germany — 2Physikalisches Institut, University of Bonn, Wegelerstrasse 8, 53115 Bonn, Germany — 3Cavendish Laboratory, University of Cambridge, JJ Thomson Avenue, Cambridge CB30HE, United Kingdom
The question of how a closed quantum system out of equilibrium evolves and relaxes, is still not well understood. A specific setting of coherent quantum dynamics can be provided by quenches when one starts from the ground state of an initial Hamiltonian and suddenly changes the Hamiltonian's parameter. After this change the system is highly excited with respect to the new Hamiltonian and evolves in time.
Here we study a three dimensional Fermi gas initially loaded into a periodic double well potential along one dimension. The superlattice enables us to prepare the initial state with fermions only occupying even wells. Afterwards the superlattice potential is suddeenly removed the time evolution of the local density imbalance between two neighboring wells is probed. The experimental results are compared to the numerical studies based on the exact diagonalization of the Hamiltonian in the continuum.