Trap-modulation spectroscopy of the Mott-insulator transition in optical lattices

Year: 2009

Authors: Lignier H., Zenesini A., Ciampini D., Morsch O., Arimondo E., Montangero S., Pupillo G., Fazio R.

Autors Affiliation: Dipartimento di Fisica “E. Fermi,” CNR-INFM, Largo Pontecorvo 3, 56127 Pisa, Italy;
CNISM UdR, Università di Pisa, Largo Pontecorvo 3, 56127 Pisa, Italy;
Institut für Quanteninformationsverarbeitung, Universität Ulm, D-89069 Ulm, Germany;
NEST CNR-INFM and Scuola Normale Superiore, Piazza dei Cavalieri 7, I-56126 Pisa, Italy;
Institute for Theoretical Physics, University of Innsbruck, A-6020 Innsbruck, Austria;
Institute for Quantum Optics and Quantum Information, A-6020 Innsbruck, Austria

Abstract: We discuss a technique to probe the properties of an interacting cold atomic gas that can be viewed as a dynamical compressibility measurement. We apply this technique to the study of the superfluid-to-Mott-insulator quantum phase transition in one and three dimensions for a bosonic gas trapped in an optical lattice. Excitations of the system are detected by time-of-flight measurements. The experimental data for the one-dimensional case are in good agreement with the results of a time-dependent density-matrix-renormalization-group calculation.


Volume: 79 (4)      Pages from: 041601  to: 041601

More Information: Financial support by MIUR under Project No. PRIN-2007 and the EU projects SCALA and NAMEQUAM is gratefully acknowledged. Numerical simulations in this work were done using the DMRG code released within the PwP project [25].
KeyWords: boson systems; metal-insulator transition; modulation spectra; optical lattices; renormalisation
DOI: 10.1103/PhysRevA.79.041601

Citations: 11
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