Exploring correlated 1D Bose gases from the superfluid to the Mott-insulator state by inelastic light scattering

Year: 2009

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

Autors Affiliation: Univ Florence, Dipartimento Fis, LENS, I-50019 Sesto Fiorentino, FI, Italy; CNR, INFM, I-50019 Sesto Fiorentino, FI, Italy

Abstract: We report the Bragg spectroscopy of interacting one-dimensional Bose gases loaded in an optical lattice across the superfluid to the Mott-insulator phase transition. Elementary excitations are created with a nonzero momentum and the response of the correlated 1D gases is in the linear regime. The complexity of the strongly correlated quantum phases is directly displayed in the spectra which exhibit novel features. This work paves the way for a precise characterization of the state of correlated gases in optical lattices.


Volume: 102 (15)      Pages from: 155301  to: 155301

More Information: We are grateful to M. Modugno for inspiring discussions and a critical reading of the manuscript. We thank K. M. R. van der Stam for early work on the experiment. We acknowledge fruitful comments from R. Citro, C. Menotti, A. Minguzzi, N. Trivedi and all of our colleagues of the Quantum Degenerate Group at LENS. This work has been supported by UE Contract No. RII3-CT-2003-506350, MIUR PRIN 2007, Ente CRF, DQS EuroQUAM Project, NAMEQUAM project and Integrated Project SCALA.
KeyWords: Bose gas; Bragg spectroscopy; Elementary excitations; Inelastic light scattering; Linear regime; Mott insulators; Mott-insulator phase transition; Nonzero momenta; One-dimensional Bose Gases; Optical lattices; Quantum phasis, Crystal lattices; Light scattering; Optical materials; Particle optics, Phase transitions
DOI: 10.1103/PhysRevLett.102.155301

Citations: 123
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