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Quantum Institute: Visitor ScheduleThe Quantum Lunch is regularly held on Thursdays in the Theoretical Division Conference Room, TA-3, Building 123, Room 121. For more information, contact Diego Dalvit. February 27, 2007 G.V. Shlyapnikov, Molecular Regimes in Ultracold Fermi Gases AbstractI will give a brief overview of recent studies of weakly bound homonuclear molecules in ultracold two-component Fermi. It will be emphasized that these (highly excited) molecules represent novel composite bosons, which exhibit features of Fermi statistics at short intermolecular distances. In particular, Pauli exclusion principle for identical fermionic atoms provides a strong suppression of collisional relaxation of such molecules into deep bound states, which allows the creation of long-lived molecular Bose-Einstein condensates. I then turn to heteronuclear molecules that should be formed in fermionic mixtures and discuss how the stability of these molecules depends on the mass ration. It will be shown that molecules formed by heavy and light fermionic atoms are characterized by a strong exchange repulsion, which can lead to the formation of Wigner crystal. |