All-optical pump-and-probe detection of two-time correlations in a Fermi gas

Journal Article · Thu Apr 15 00:00:00 EDT 2010 · Physical Review. A

DOI:https://doi.org/10.1103/PHYSREVA.81.043626· OSTI ID:21431019

Dao, T -L ^[1]; Kollath, C ^[1]; Carusotto, I ^[2]; Koehl, M ^[3]

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1. Centre de Physique Theorique, Ecole Polytechnique, CNRS, F-91128 Palaiseau (France)
2. CNR-INFM BEC Center and Dipartimento di Fisica, Universita di Trento, I-38050 Povo (Italy)
3. Cavendish Laboratory, University of Cambridge, JJ Thomson Avenue, Cambridge CB3 0HE (United Kingdom)

We propose an all-optical scheme to probe the dynamical correlations of a strongly interacting gas of ultracold atoms in an optical lattice potential. The proposed technique is based on a pump-and-probe scheme: a coherent light pulse is initially converted into an atomic coherence and later retrieved after a variable storage time. The efficiency of the proposed method to measure the two-time one-particle Green function of the gas is validated by numerical and analytical calculations of the expected signal for the two cases of a normal Fermi gas and a BCS superfluid state. Protocols to extract the superfluid gap and the full quasiparticle dispersions are discussed.

• OSTI ID: 21431019
• Journal Information: Physical Review. A, Vol. 81, Issue 4; Other Information: DOI: 10.1103/PhysRevA.81.043626; (c) 2010 The American Physical Society; ISSN 1050-2947
• Country of Publication: United States
• Language: English

Related Subjects

75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
74 ATOMIC AND MOLECULAR PHYSICS
ATOMS
CORRELATIONS
DETECTION
FERMI GAS
GREEN FUNCTION
PROBES
PULSES
SIGNALS
SUPERFLUIDITY
FUNCTIONS