Pairing fluctuations in trapped Fermi gases
arXiv:cond-mat/0402620 · doi:10.1103/PhysRevLett.93.110406
Abstract
Fluctuations of the amplitude of the order parameter govern the properties of superconducting systems close to the critical transition temperature. In the BCS regime we examine the contribution of these pairing fluctuations to the superfluid order parameter for harmonically confined atomic Fermi gases. In the limit of small systems we obtain an expression for the space dependence of the fluctuations, in good agreement with the results of numerical calculations. In this limit we also predict a parity effect, i.e. that pairing fluctuations should show a maximum or a minimum at the centre of the trap, depending on the value of the last occupied shell being even or odd. We finally propose to detect pairing fluctuations by measuring the density-density correlation function as evaluated after a ballistic expansion of the gas.
4 pages, 2 figures
References in corpus (26)
- Observation of resonance condensation of fermionic atom pairs
- Observation of a Strongly-Interacting Degenerate Fermi Gas of Atoms
- Observation of Bose-Einstein Condensation of Molecules
- Creation of ultracold molecules from a Fermi gas of atoms
- Crossover from a molecular Bose-Einstein condensate to a degenerate Fermi gas
- Superfluid Fermi Gases with Large Scattering Length
- Probing many-body states of ultra-cold atoms via noise correlations
- Resonance superfluidity in a quantum degenerate Fermi gas
- The BCS-BEC Crossover in a Gas of Fermi Atoms with a Feshbach Resonance
- Two-species mixture of quantum degenerate Bose and Fermi gases
- Production of Long-Lived Ultracold Li2 Molecules from a Fermi gas
- Measurement of interaction energy near a Feshbach resonance in a 6Li Fermi gas
- Measurement of positive and negative scattering lengths in a Fermi gas of atoms
- Superfluidity of spin-polarized 6Li
- Influence of Induced Interactions on the Superfluid Transition in Dilute Fermi Gases
- All-Optical Production of a Degenerate Fermi Gas
- BCS Theory for Trapped Ultracold Fermions
- Pauli Blocking of Collisions in a Quantum Degenerate Atomic Fermi Gas
- Sympathetic cooling of bosonic and fermionic Lithium gases towards quantum degeneracy
- Achieving a BCS transition in an atomic Fermi gas
- Laser probing of atomic Cooper pairs
- Critical temperature and Ginzburg-Landau equation for a trapped Fermi gas
- Trapped Li : A high T_c superfluid ?
- Cooper pairing and single particle properties of trapped Fermi gases
- Shell structure and pairing for interacting fermions in a trap
- Effects of the trapping potential on a superfluid atomic Fermi Gas
Cited by in corpus (10)
- Condensed Matter Theory of Dipolar Quantum Gases
- Pairing in a system of a few attractive fermions in a harmonic trap
- Pairing of few Fermi atoms in one dimension
- Theory of fluctuations in a two-band superconductor
- Density correlations in ultracold atomic Fermi gases
- Unconventional pairing in one-dimensional systems of a few mass-imbalanced ultracold fermions
- Reduced density matrix approach to ultracold few-fermion systems in one dimension
- BCS pairing in a trapped dipolar Fermi gase
- Parity effect in a mesoscopic Fermi gas
- Density correlations in ultracold Fermi systems within the exact Richardson solution