Compressibility of an ultracold Fermi gas with repulsive interactions

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Compressibility of an ultracold Fermi gas with repulsive interactions

Ye-Ryoung Lee,1 Myoung-Sun Heo,1 Jae-Hoon Choi,1 Tout T. Wang,1,2 Caleb A. Christensen,1 Timur M. Rvachov,1 and Wolfgang Ketterle1 1MIT-Harvard Center for Ultracold Atoms, Research Laboratory of Electronics, Department of Physics, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA 2MIT-Harvard Center for Ultracold Atoms, Department of Physics, Harvard University, Cambrid...

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Ultracold fermions with repulsive interactions

An ultracold Fermi gas with repulsive interaction has been studied. For weak interactions, the atomic gas is metastable, and the interactions were characterized by obtaining the isothermal compressibility from atomic density profiles. For stronger interactions (kFa  1), rapid conversion into Feshbach molecules is observed. When the conversion rate becomes comparable to the Fermi energy divided...

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Collisions and expansion of an ultracold dilute Fermi gas

– We discuss the effects of collisions on the expansion of a degenerate normal Fermi gas, following the sudden removal of the confining trap. Using a Boltzmann equation approach, we calculate the time dependence of the aspect ratio and the entropy increase of the expanding atomic cloud taking into account the collisional effects due to the deformation of the distribution function in momentum sp...

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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 interactions the weakly damped oscillation, observed for the noninteracting case, turns into a sl...

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Bragg scattering of cooper pairs in an ultracold Fermi gas.

We present a theoretical treatment of Bragg scattering of a degenerate Fermi gas in the weakly interacting BCS regime. Our numerical calculations predict correlated scattering of Cooper pairs into a spherical shell in momentum space. The scattered shell of correlated atoms is centered at half the usual Bragg momentum transfer, and can be clearly distinguished from atoms scattered by the usual s...

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ژورنال

عنوان ژورنال: Physical Review A

سال: 2012

ISSN: 1050-2947,1094-1622

DOI: 10.1103/physreva.85.063615