Hannover 2010 – wissenschaftliches Programm
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Q: Fachverband Quantenoptik und Photonik
Q 65: Quantum Gases : Lattices III
Q 65.3: Vortrag
Freitag, 12. März 2010, 14:45–15:00, E 001
Quantitative temperature determination of ultracold fermions in an optical lattice — •Thomas Uehlinger1, Robert Jördens1, Daniel Greif1, Niels Strohmaier1, Leticia Tarruell1, Henning Moritz1, Tilman Esslinger1, Lorenzo De Leo2, Corinna Kollath2, Antoine Georges2,3, Vito Scarola4, Lode Pollet5, Evgeni Burovski6, Evgeny Kozik7, and Matthias Troyer7 — 1Institute for Quantum Electronics, ETH Zurich, 8093 Zurich, Switzerland — 2Centre de Physique Théorique, CNRS, Ecole Polytechnique, 91128 Palaiseau, France — 3Collège de France, 11 place Marcelin Berthelot, 75231 Paris, France — 4Department of Physics, Virginia Tech, Blacksburg, Virginia 24061, USA — 5Department of Physics, Harvard University, Cambridge, Massachusetts 02138, USA — 6Laboratoire de Physique Théorique et Modèles Statistiques, Université Paris-Sud, 91405 Orsay, France — 7Institute for Theoretical Physics, ETH Zurich, 8093 Zurich, Switzerland
While experiments with ultracold fermions in optical lattices are approaching magnetically ordered states of the Fermi Hubbard model, a reliable determination of temperature in the regime of intermediate interaction has yet not been possible. We compare precise measurements of the double occupancy in our system with both DMFT calculations and the high-temperature series expansion. Both methods agree with the experimental data over a wide range of parameters. The entropy per atom in the center of the trap is about twice as large as the entropy required to enter the Néel phase. The corresponding temperature reaches values on the order of the tunneling energy t.