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Asymmetric two-component Fermion systems in strong coupling.

J Carlson1, Sanjay Reddy

  • 1Theoretical Division, Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA.

Physical Review Letters
|August 11, 2005
PubMed
Summary
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A finite number asymmetry in dilute two-component Fermi systems with attractive interactions can lead to phase separation or a homogeneous phase with quasiparticles, depending on coupling strength. These findings are relevant for cold atom experiments.

Area of Science:

  • Condensed Matter Physics
  • Quantum Gases
  • Atomic Physics

Background:

  • Two-component Fermi systems with attractive interactions exhibit complex phase structures.
  • Understanding the impact of number asymmetry (polarization) on superfluidity is crucial.

Purpose of the Study:

  • Investigate the phase structure of a dilute two-component Fermi system.
  • Analyze the effects of coupling strength and finite number asymmetry on the system's phases.
  • Explore the emergence of quasiparticles in strongly coupled regimes.

Main Methods:

  • Theoretical study of phase structure as a function of coupling and number asymmetry.
  • Calculation of single-particle excitation spectrum and ground-state energy near the infinite-scattering length.
  • Analysis of phase separation versus homogeneous phase stability.

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Main Results:

  • Weak coupling leads to phase separation, favoring a mixed phase of superfluid and normal matter.
  • Strong coupling increases stress on the superfluid phase due to asymmetry.
  • Modest polarizations reveal weakly interacting quasiparticles with a gapless spectrum, favoring a homogeneous phase.

Conclusions:

  • The phase behavior of Fermi systems is sensitive to both interaction strength and particle number imbalance.
  • Homogeneous phases with quasiparticles are favored over phase-separated states in certain regimes.
  • The predicted states are potentially realizable in cold atom experiments.