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Superfluid Fermi gases with large scattering length.

J Carlson¹, S-Y Chang, V R Pandharipande

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

Physical Review Letters

|August 9, 2003

Summary

Quantum Monte Carlo calculations reveal that superfluid Fermi gases with attractive interactions have energies about 0.44 times that of noninteracting gases. Their pairing gap is approximately double the energy per particle, indicating strong superfluidity.

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Area of Science:

Quantum physics
Condensed matter physics

Background:

Superfluid Fermi gases are a key system for studying quantum many-body phenomena.
Understanding the properties of these gases is crucial for fields ranging from nuclear physics to condensed matter.

Purpose of the Study:

To investigate the properties of superfluid Fermi gases with short-range two-body attractive interactions.
To determine the energy and pairing gap of these systems using quantum Monte Carlo methods.

Main Methods:

Quantum Monte Carlo calculations were employed.
The study focused on Fermi gases with short-range two-body attractive interactions and infinite scattering length.

Main Results:

The energy of the superfluid Fermi gas was estimated to be (0.44+/-0.01) times that of the noninteracting gas.

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The pairing gap was found to be approximately twice the energy per particle.

Conclusions:

The results provide valuable insights into the behavior of strongly interacting Fermi gases.
The findings suggest robust superfluidity in these systems.