Multi-band spectroscopy of inhomogeneous Mott-insulator states of ultracold bosons

Year: 2009

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

Autors Affiliation: LENS, Dipartimento di Fisica, Università di Firenze and INFM-CNR, via Nello Carrara 1, I-50019 Sesto Fiorentino (FI), Italy

Abstract: In this work, we use inelastic scattering of light to study the response of inhomogeneous Mott-insulator gases to external excitations. The experimental setup and procedure to probe the atomic Mott states are presented in detail. We discuss the link between the energy absorbed by the gases and accessible experimental parameters as well as the linearity of the response to the scattering of light. We investigate the excitations of the system in multiple energy bands and a band-mapping technique allows us to identify band and momentum of the excited atoms. In addition, the momentum distribution in the Mott states that is spread over the entire first Brillouin zone enables us to reconstruct the dispersion relation in the high energy bands using a single Bragg excitation with a fixed momentum transfer.

Journal/Review: NEW JOURNAL OF PHYSICS

Volume: 11      Pages from: 103030  to: 103030

More Information: We acknowledge E Altman, S Huber and all the colleagues of the Quantum Degenerate Group at LENS for stimulating discussions. This work was 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 (DC).
KeyWords: Dispersion relations; Energy band; Excited atoms; Experimental parameters; Experimental setup; External excitation; First Brillouin zone; High energy bands; Mapping techniques; Momentum distributions; Mott insulators; Mott state; Multiband; Ultracold bosons, Band structure
DOI: 10.1088/1367-2630/11/10/103030

Citations: 22
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