Phase operators and blurring time of a pair-condensed Fermi gas

Phase operators and blurring time of a pair-condensed Fermi gas

Thermal blurring of a coherent Fermi gas

It is generally assumed that a condensate of paired fermions at equilibrium is characterized by a macroscopic wavefunction with a well-defined, immutable phase. In reality, all systems have a finite size and are prepared at non-zero temperature; the condensate has then a finite coherence time, even when the system is isolated in its evolution and the particle number N is fixed. The loss of phas...

Three-phonon and four-phonon interaction processes in a pair-condensed Fermi gas

Phase Diagram of a Polarized Fermi Gas

The polarized Fermi gas, which has recently been realized in ultra-cold atomic gases where the number of atoms in the two spin states is different, has attracted many experimental and theoretical works. This paper introduces the phase diagram of the polarized Fermi gas at T = 0 and at finite temperature as well. Open questions that haven’t been solved are pointed out and available experiments a...

Correlations and pair formation in a repulsively interacting Fermi gas.

A degenerate Fermi gas is rapidly quenched into the regime of strong effective repulsion near a Feshbach resonance. The spin fluctuations are monitored using speckle imaging and, contrary to several theoretical predictions, the samples remain in the paramagnetic phase for an arbitrarily large scattering length. Over a wide range of interaction strengths a rapid decay into bound pairs is observe...