Scientific Results

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

Year: 2010

Authors: Dao T.-L, Kollath C., Carusotto I., Köhl M.

Autors Affiliation: Centre de Physique Théorique, École Polytechnique, CNRS, F-91128 Palaiseau, France;
Laboratoire Charles Fabry de l’Institut d’Optique, CNRS and Univ. Paris-Sud, Campus Polytechnique, RD 128, F-91127 Palaiseau cedex, France;
CNR-INFM BEC Center and Dipartimento di Fisica, Università di Trento, I-38050 Povo, Italy;
Cavendish Laboratory, University of Cambridge, JJ Thomson Avenue, Cambridge CB3 0HE, United Kingdom

Abstract: 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.

Journal/Review: PHYSICAL REVIEW A

Volume: 81 (4)      Pages from: 043626  to: 043626

More Information: We are grateful to F. Bariani, M. Capone, M. Inguscio, and the Quantum Optics group of ETH Zurich for stimulating discussions. We acknowledge support from the Triangle de la Physique, ANR (FABIOLA and FAMOUS), the DARPA-OLE program, and EPSRC (EP/G029547/1). C. K. acknowledges the IPAM for its hospitality.
DOI: 10.1103/PhysRevA.81.043626

Citations: 5
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