Extracting the condensate density from projection experiments with Fermi gases
arXiv:cond-mat/0501631 · doi:10.1103/PhysRevLett.95.010407
Abstract
A debated issue in the physics of the BCS-BEC crossover with trapped Fermi atoms is to identify characteristic properties of the superfluid phase. Recently, a condensate fraction was measured on the BCS side of the crossover by sweeping the system in a fast (nonadiabatic) way from the BCS to the BEC sides, thus ``projecting'' the initial many-body state onto a molecular condensate. We analyze here the theoretical implications of these projection experiments, by identifying the appropriate quantum-mechanical operator associated with the measured quantities and relating them to the many-body correlations occurring in the BCS-BEC crossover. Calculations are presented over wide temperature and coupling ranges, by including pairing fluctuations on top of mean field.
4 pages, 4 figures
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Cited by in corpus (24)
- Many-Body Physics with Ultracold Gases
- Theory of ultracold Fermi gases
- Production of cold molecules via magnetically tunable Feshbach resonances
- Direct Observation of the Superfluid Phase Transition in Ultracold Fermi Gases
- Observation of pseudogap behavior in a strongly interacting Fermi gas
- The BCS-BEC crossover: From ultra-cold Fermi gases to nuclear systems
- Momentum distribution and condensate fraction of a Fermi gas in the BCS-BEC crossover
- BCS-to-BEC crossover from the exact BCS solution
- Excitonic Superfluidity and Screening in Electron-Hole Bilayer Systems
- Pseudogaps in strongly interacting Fermi gases
- Evidence from quantum Monte Carlo of large gap superfluidity and BCS-BEC crossover in double electron-hole layers
- Fulde-Ferrell-Larkin-Ovchinnikov pairing as leading instability on the square lattice
- Understanding the superfluid phase diagram in trapped Fermi gases
- Stability of fermionic Feshbach molecules in a Bose-Fermi mixture
- Quantum dark solitons in ultracold one-dimensional Bose and Fermi gases
- Probing Fermionic Condensates by Fast-Sweep Projection onto Feshbach Molecules
- Pair formation in quenched unitary Bose gases
- Three-dimensional electron-hole superfluidity in a superlattice close to room temperature
- Probing two Higgs oscillations in a one-dimensional Fermi superfluid with Raman-type spin-orbit coupling
- Emergence of dark soliton signatures in a one-dimensional unpolarized attractive Fermi gas on a ring
- Experimental realization of BCS-BEC crossover physics with a Fermi gas of atoms
- Mechanical stability of resonant Bose-Fermi mixtures
- Shape-resonant superconductivity in nanofilms: from weak to strong coupling
- Strong Fulde-Ferrell Larkin-Ovchinnikov pairing fluctuations in polarized Fermi systems