Bragg spectroscopy of strongly correlated bosons in optical lattices

David Clément (1) , Nicole Fabbri (1) , Leonardo Fallani (1) , Chiara Fort (1) , Massimo Inguscio (1)

1 LENS - European Laboratory for Non-Linear Spectroscopy

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,ω) and about the one-particle spectral function A(q,ω) from the Bragg spectra. This technique could be extended to study more exotic correlated phases of ultracold atoms.

Domaines: Matière Molle [cond-mat.soft]

David Clément, Nicole Fabbri, Leonardo Fallani, Chiara Fort, Massimo Inguscio. Bragg spectroscopy of strongly correlated bosons in optical lattices. Journal of Low Temperature Physics, 2010, 158 (1-2), http://www.springerlink.com/content/uu8t6n256m206606/. ⟨10.1007/s10909-009-0040-7⟩. ⟨hal-00620050⟩