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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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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cited_by cdi_FETCH-LOGICAL-c335t-40c27fd8a8907490c84849f089ebc7eb3df32c205fc23a0270749427f58c4f993
cites cdi_FETCH-LOGICAL-c335t-40c27fd8a8907490c84849f089ebc7eb3df32c205fc23a0270749427f58c4f993
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container_issue 22
container_start_page 220601
container_title Physical review letters
container_volume 99
creator Strohmaier, Niels
Takasu, Yosuke
Günter, Kenneth
Jördens, Robert
Köhl, Michael
Moritz, Henning
Esslinger, Tilman
description 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.
doi_str_mv 10.1103/PhysRevLett.99.220601
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source American Physical Society:Jisc Collections:APS Read and Publish 2023-2025 (reading list)
subjects CENTER-OF-MASS SYSTEM
CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS
EVOLUTION
FERMI GAS
INTERACTIONS
OSCILLATIONS
THREE-DIMENSIONAL CALCULATIONS
TRAPS
TUNNEL EFFECT
title Interaction-controlled transport of an ultracold fermi gas
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