Interaction-controlled transport of an ultracold fermi gas

We explore the transport properties of an interacting Fermi gas in a three-dimensional optical lattice. The center of mass dynamics of the atoms after a sudden displacement of the trap minimum is monitored for different interaction strengths and lattice fillings. With increasingly strong attractive...

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Bibliographic Details
Published in:Physical review letters 2007-11, Vol.99 (22), p.220601-220601, Article 220601
Main Authors: Strohmaier, Niels, Takasu, Yosuke, Günter, Kenneth, Jördens, Robert, Köhl, Michael, Moritz, Henning, Esslinger, Tilman
Format: Article
Language:English
Subjects:
CENTER-OF-MASS SYSTEM
CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS
EVOLUTION
FERMI GAS
INTERACTIONS
OSCILLATIONS
THREE-DIMENSIONAL CALCULATIONS
TRAPS
TUNNEL EFFECT
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Summary:We explore the transport properties of an interacting Fermi gas in a three-dimensional optical lattice. The center of mass dynamics of the atoms after a sudden displacement of the trap minimum is monitored for different interaction strengths and lattice fillings. With increasingly strong attractive interactions the weakly damped oscillation, observed for the noninteracting case, turns into a slow relaxational drift. Tuning the interaction strength during the evolution allows us to dynamically control the transport behavior. Strong attraction between the atoms leads to the formation of local pairs with a reduced tunneling rate. The interpretation in terms of pair formation is supported by a measurement of the number of doubly occupied lattice sites. This quantity also allows us to determine the temperature of the noninteracting gas in the lattice to be as low as (27+/-2)% of the Fermi temperature.
ISSN:0031-9007
1079-7114
DOI:10.1103/PhysRevLett.99.220601