Establishing the Presence of Coherence in Atomic Fermi Superfluids: Spin-Flip and Spin-Preserving Bragg Scattering at Finite Temperatures

Journal Article · Fri Sep 17 00:00:00 EDT 2010 · Physical Review Letters

DOI:https://doi.org/10.1103/PHYSREVLETT.105.120401· OSTI ID:21466956

Hao, Guo; Levin, K ^[1]; Chien, Chih-Chun ^[2]

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1. James Franck Institute and Department of Physics, University of Chicago, Chicago, Illinois 60637 (United States)
2. Theoretical Division, Los Alamos National Laboratory, MS B213, Los Alamos, New Mexico 87545 (United States)

We show how in ultracold Fermi gases the difference between the finite temperature T structure factors, called S{sub -}({omega},q), associated with spin and density, reflects coherent order at all {omega}, q, k{sub F}a, and T. This observation can be exploited in two photon Bragg scattering experiments on gases which are subject to variable attractive interactions. Our calculations incorporate spin and particle number conservation laws which lead to compatibility at general T with two f-sum rules. Because of its generality a measurement of S{sub -}({omega},q) can be a qualitative, direct, in situ approach for establishing superfluid order.

• OSTI ID: 21466956
• Journal Information: Physical Review Letters, Vol. 105, Issue 12; Other Information: DOI: 10.1103/PhysRevLett.105.120401; (c) 2010 American Institute of Physics; ISSN 0031-9007
• Country of Publication: United States
• Language: English

Related Subjects

75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
BRAGG REFLECTION
DENSITY
FERMI GAS
PHOTONS
SCATTERING
SPIN
SPIN FLIP
STRUCTURE FACTORS
SUM RULES
SUPERFLUIDITY
ANGULAR MOMENTUM
BOSONS
DIMENSIONLESS NUMBERS
ELEMENTARY PARTICLES
EQUATIONS
MASSLESS PARTICLES
PARTICLE PROPERTIES
PHYSICAL PROPERTIES
REFLECTION