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Homogeneous Atomic Fermi Gases

Accepted version
Peer-reviewed

Type

Article

Change log

Authors

Mukherjee, B 
Yan, Z 
Patel, PB 
Yefsah, T 

Abstract

We report on the creation of homogeneous Fermi gases of ultracold atoms in a uniform potential. In the momentum distribution of a spin-polarized gas, we observe the emergence of the Fermi surface and the saturated occupation of one particle per momentum state: the striking consequence of Pauli blocking in momentum space for a degenerate gas. Cooling a spin-balanced Fermi gas at unitarity, we create homogeneous superfluids and observe spatially uniform pair condensates. For thermodynamic measurements, we introduce a hybrid potential that is harmonic in one dimension and uniform in the other two. The spatially resolved compressibility reveals the superfluid transition in a spin-balanced Fermi gas, saturation in a fully polarized Fermi gas, and strong attraction in the polaronic regime of a partially polarized Fermi gas.

Description

Keywords

cond-mat.quant-gas, cond-mat.quant-gas

Journal Title

Physical Review Letters

Conference Name

Journal ISSN

0031-9007
1079-7114

Volume Title

118

Publisher

American Physical Society
Sponsorship
Engineering and Physical Sciences Research Council (EP/N011759/1)
This work was supported by the NSF, the ARO MURI on Atomtronics, AFOSR PECASE and MURI on Exotic Phases, and the David and Lucile Packard Foundation. Z. H. acknowledges support from EPSRC (Grant No. EP/N011759/1).