Finite-temperature phase diagram of a spin-polarized ultracold Fermi gas in a highly elongated harmonic trap

Liu, Xia-Ji, Hu, Hui and Drummond, Peter D. (2008) Finite-temperature phase diagram of a spin-polarized ultracold Fermi gas in a highly elongated harmonic trap. Physical Review A: Atomic, Molecular and Optical Physics, 78 2: . doi:10.1103/PhysRevA.78.023601

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Author Liu, Xia-Ji
Hu, Hui
Drummond, Peter D.
Title Finite-temperature phase diagram of a spin-polarized ultracold Fermi gas in a highly elongated harmonic trap
Journal name Physical Review A: Atomic, Molecular and Optical Physics   Check publisher's open access policy
ISSN 1050-2947
1094-1622
Publication date 2008-08-01
Sub-type Article (original research)
DOI 10.1103/PhysRevA.78.023601
Open Access Status File (Publisher version)
Volume 78
Issue 2
Total pages 8
Place of publication College Park, MD, United States
Publisher American Physcial Society
Collection year 2009
Language eng
Abstract We investigate the finite-temperature properties of an ultracold atomic Fermi gas with spin population imbalance in a highly elongated harmonic trap. Previous studies at zero temperature showed that the gas stays in an exotic spatially inhomogeneous Fulde-Ferrell-Larkin-Ovchinnikov (FFLO) superfluid state at the trap center; while moving to the edge, the system changes into either a nonpolarized Bardeen-Cooper-Schrieffer superfluid (PPc), depending on the smallness of the spin polarization P, relative to a critical value Pc. In this work, we show how these two phase-separation phases evolve with increasing temperature, and thereby construct a finite-temperature phase diagram. For typical interactions, we find that the exotic FFLO phase survives below one-tenth of Fermi degeneracy temperature, which seems to be accessible in the current experiment. The density profile, equation of state, and specific heat of the polarized system have been calculated and discussed in detail. Our results are useful for the ongoing experiment at Rice University on the search for FFLO states in quasi-one-dimensional polarized Fermi gases.
Keyword Equations of state
Fermion systems
Phase diagrams
Phase separation
Specific heat
Spin polarised transport
Superfluidity
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: 2009 Higher Education Research Data Collection
School of Mathematics and Physics
 
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Created: Thu, 09 Apr 2009, 13:39:29 EST by Stephanie Golding on behalf of ARC Centre of Excellence for Quantum-Atom Optics