Superfluidity in three-species mixtures of Fermi gases across Feshbach resonances

Journal Article · Thu Mar 15 04:00:00 EDT 2007 · Physical Review. A

DOI:https://doi.org/10.1103/PHYSREVA.75.031603· OSTI ID:20982225

Zhai, Hui ^[1]

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1. Department of Physics, Ohio-State University, Columbus, Ohio 43210 (United States)

In this Rapid Communication a generalization of the BEC-BCS crossover theory to a multicomponent superfluid is presented by studying a three-species mixture of Fermi gas across two Feshbach resonances. At the BEC side of resonances, two kinds of molecules are stable which gives rise to a two-component Bose condensate. This two-component superfluid state can be experimentally identified from the radio-frequency spectroscopy, density profile, and short noise measurements. As approaching the BCS side of resonances, the superfluidity will break down at some point and yield a first-order quantum phase transition to normal state, due to the mismatch of three Fermi surfaces. Phase separation instability will occur around the critical regime.

• OSTI ID: 20982225
• Journal Information: Physical Review. A, Journal Name: Physical Review. A Journal Issue: 3 Vol. 75; ISSN 1050-2947; ISSN PLRAAN
• Country of Publication: United States
• Language: English

Related Subjects

74 ATOMIC AND MOLECULAR PHYSICS
BCS THEORY
BOSE-EINSTEIN CONDENSATION
COMMUNICATIONS
CONDENSATES
DENSITY
FERMI GAS
FERMI LEVEL
FERMIONS
INSTABILITY
MIXTURES
MOLECULES
NOISE
PHASE TRANSFORMATIONS
RADIOWAVE RADIATION
RESONANCE
SPECTROSCOPY
SUPERFLUIDITY