Bragg spectroscopy of strongly correlated bosons in optical lattices

Year: 2010

Authors: Clément D., Fabbri N., Fallani L., Fort C., Inguscio M.

Autors Affiliation: LENS—University of Florence and CNR-INFM, Via Nello Carrara 1, 50019 Sesto Fiorentino, Italy

Abstract: Using inelastic scattering of light (Bragg spectroscopy), we study the low-energy excitations of strongly correlated phases of ultracold bosons on the cross-over from correlated 1D superfluids to Mott insulators. As it is commonly performed in solid-state physics, the use of such a probe allows us to extract important information about the atomic many-body state. In particular we show that we can extract information about the dynamical structure factor S(q, omega) and about the one-particle spectral function A(q, omega) from the Bragg spectra. This technique could be extended to study more exotic correlated phases of ultracold atoms.

Journal/Review: JOURNAL OF LOW TEMPERATURE PHYSICS

Volume: 158 (1-2)      Pages from: 5  to: 15

More Information: We acknowledge E. Altman, S. Huber, M. Modugno and all the colleagues from LENS for stimulating discussions. This work has been supported by UE contract No. RII3-CT-2003-506350, MIUR PRIN 2007, Ente Cassa di Risparmio di Firenze, DQS EuroQUAM Project, NAMEQUAM project and Integrated Project SCALA. This research was supported by a Marie Curie Intra European Fellowship within the 7th European Community Framework Programme (D.C.).
KeyWords: Bragg spectroscopy; Cross-over; Dynamical structure; Low-energy excitations; Many-body state; Mott insulators; Optical lattices; Spectral function; Strongly correlated bosons; Ultracold atoms; Ultracold bosons, Atoms; Bosons; Bragg cells, Atomic spectroscopy
DOI: 10.1007/s10909-009-0040-7

Citations: 22
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