Multiband spectroscopy of ultracold fermions: observation of reduced tunneling in attractive Bose-Fermi mixtures |
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Authors: | Heinze J Götze S Krauser J S Hundt B Fläschner N Lühmann D-S Becker C Sengstock K |
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Affiliation: | Institut für Laser-Physik, Universit?t Hamburg, Germany. |
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Abstract: | We perform a detailed experimental study of the band excitations and tunneling properties of ultracold fermions in optical lattices. Employing a novel multiband spectroscopy for fermionic atoms, we can measure the full band structure and tunneling energy with high accuracy. In an attractive Bose-Fermi mixture we observe a significant reduction of the fermionic tunneling energy, which depends on the relative atom numbers. We attribute this to an interaction-induced increase of the lattice depth due to the self-trapping of the atoms. |
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