Hannover 2010 – scientific programme

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Q: Fachverband Quantenoptik und Photonik

Q 65: Quantum Gases : Lattices III

Q 65.2: Talk

Friday, March 12, 2010, 14:30–14:45, E 001

Linear response thermometry with ultracold fermions in an optical lattice — •Daniel Greif, Leticia Tarruell, Thomas Uehlinger, Robert Jördens, Niels Strohmaier, Henning Moritz, and Tilman Esslinger — Institute for Quantum Electronics, ETH Zurich, 8093 Zurich, Switzerland

The low-temperature Fermi-Hubbard model is expected to capture many fascinating phenomena such as d-wave superfluidity. In our experiment we use a repulsive two-component Fermi gas loaded into a 3D optical lattice to realize this simple model Hamiltonian. Currently several experiments are reaching out to achieve even lower temperatures with novel cooling schemes in order to access and characterize the magnetically ordered state. This requires a temperature sensitive probe in the lattice.

We show how linear response to weak lattice modulation can be used as a thermometer in the lattice. This can also be employed as a detector for local spin ordering.