aqora

Phases of a Paired Fermi Gas with Unequal Spin Populations

Guthrie B. Partridge, Wenhui Li, Yean-an Liao +1 more

We have produced a two-component gas of ultracold, fermionic 6Li atoms with unequal spin populations. The real-space densities reveal two distinct superfluid phases, both with an evenly paired central core.

Quantum Electronics and Laser Science ConferenceMay 6, 20070 citations

Phases of a fermi gas with unequal spin populations

Guthrie B. Partridge, Wenhui Li, Yean-an Liao +1 more

We have produced a two-component gas of ultracold, fermionic 6Li atoms with unequal spin populations. The real-space densities reveal two distinct superfluid phases, both with an evenly paired central core.

Quantum Electronics and Laser Science ConferenceMay 1, 20070 citations

POLARIZED ATOMIC FERMI GASES

Wenhui Li, Guthrie B. Partridge, Yunxiang Liao +1 more

We review recent experimental studies on polarized atomic Fermi gases. The particular focus is on our own experiments of strongly interacting two-component Fermi gases with imbalanced populations. The real-space density distributions reveal a superfluid/normal phase separation at very low temperatures, accompanied by deformation of evenly paired core; at higher temperatures, a partially polarized phase is observed.

International Journal of Modern Physics BJun 20, 20095 citations

Spatial Deformation in a Phase Separated Fermi Gas

Guthrie B. Partridge, W. Li, Yunxiang Liao +3 more

Phase separation between a uniformly paired core and excess unpaired atoms is observed in a two component strongly interacting ultra-cold gas of fermionic 6Li. Spatial deformations in the density distributions violate the local density approximation.

Frontiers in OpticsJan 1, 20061 citation

Fermionic Atoms Appear to Pair Up Much as Electrons Do in a Superconductor

Barbara Goss Levi

A new experiment reports pair formation when a gas of ultracold potassium-40 atoms is in the largely unexplored region of strong interactions.

Physics TodayMar 1, 20042 citations

Deformation of a Trapped Fermi Gas with Unequal Spin Populations

Guthrie B. Partridge, Wenhui Li, Yunxiang Liao +3 more

The real-space densities of a polarized strongly interacting two-component Fermi gas of 6Li atoms reveal two low-temperature regimes, both with a fully paired core. At the lowest temperatures, the unpolarized core deforms with increasing polarization. Sharp boundaries between the core and the excess unpaired atoms are consistent with a phase separation driven by a first-order phase transition. In contrast, at higher temperatures the core does not deform but remains unpolarized up to a critical polarization. The boundaries are not sharp in this case, indicating a partially polarized shell between the core and the unpaired atoms. The temperature dependence is consistent with a tricritical point in the phase diagram.The real-space densities of a polarized strongly interacting two-component Fermi gas of 6Li atoms reveal two low-temperature regimes, both with a fully paired core. At the lowest temperatures, the unpolarized core deforms with increasing polarization. Sharp boundaries between the core and the excess unpaired atoms are consistent with a phase separation driven by a first-order phase transition. In contrast, at higher temperatures the core does not deform but remains unpolarized up to a critical polarization. The boundaries are not sharp in this case, indicating a partially polarized shell between the core and the unpaired atoms. The temperature dependence is consistent with a tricritical point in the phase diagram.

arXiv:cond-mat/0608455Physical Review LettersNov 10, 2006262 citations

Fermion Pairing with Unequal Spin Populations

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Fermion Pairing with Unequal Spin Populations

Abstract

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