Probing quasiparticle states in strongly interacting atomic gases by momentum-resolved Raman photoemission spectroscopy

Year: 2009

Authors: Dao T.L., Carusotto I., Georges A.

Autors Affiliation: Centre de Physique Théorique, Ecole Polytechnique, CNRS, 91128 Palaiseau Cedex, France; CNR-INFM BEC Center and Università di Trento, 38050 Povo, Italy; Institute for Quantum Electronics, ETH Zürich, 8093 Zürich, Switzerland; Collège de France, 11 Place Marcelin Berthelot, 75005 Paris, France

Abstract: We investigate a momentum-resolved Raman spectroscopy technique which is able to probe the one-body spectral function and the quasiparticle states of a gas of strongly interacting ultracold atoms. This technique is inspired by angle-resolved photoemission spectroscopy, a powerful experimental probe of electronic states in solid-state systems. Quantitative examples of experimentally accessible spectra are given for the most significant regimes along the BEC-BCS crossover. When the theory is specialized to rf spectroscopy, agreement is found with recent experimental data. The main advantages of this Raman spectroscopy over existing techniques are pointed out.

Journal/Review: PHYSICAL REVIEW A

Volume: 80 (2)      Pages from: 023627  to: 023627

More Information: We acknowledge the support of the Agence Nationale de la Recherche under contracts GASCOR and FABIOLA, and of the DARPA-OLE program.
DOI: 10.1103/PhysRevA.80.023627

Citations: 22
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