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Q: Fachverband Quantenoptik und Photonik
Q 7: Quantengase: Bosonen im Gitter I
Q 7.1: Vortrag
Montag, 2. März 2009, 14:00–14:15, VMP 6 HS-A
Light Scattering by Ultracold Atoms in Optical Lattices — •Stefan Rist1, Giovanna Morigi1, and Chiara Menotti2 — 1Departament de Fisica, Universitat Autonoma de Barcelona — 2BEC-INFM Dipartimento di Fisica, Università di Trento
Light scattering by an ultracold atomic gas in a one-dimensional optical lattice is theoretically studied, when the atoms are probed by a weak laser. We analyze the intensity of the scattered light as a function of the angle of emission for different values of the tunneling rate, spanning from the superfluid to the Mott-insulator phase. We show how the excitation spectrum of the many body system can be measured by observing of the scattered light intensity as a function of the scattering angle and photon frequency. We identify different features in the first order coherence of the scattered light, depending on whether the atoms are in the Mott-insulator or superfluid state. We discuss our results with respect to previous studies, where the structure form factor was evaluated by a time-of-flight measurement [1] and where light scattering by ultracold atoms in an optical lattice was determined, neglecting the tunneling rate [2].
[1] A.M. Rey et al., Phys. Rev. A 72, 023407 (2005)
[2] I.B.Mekhov et al., Phys. Rev. Lett. 98, 100402 (2007)