Mean-field description of ultracold bosons on disordered two-dimensional optical lattices

Year: 2007

Authors: Buonsante P., Massel F., Penna V., Vezzani A.

Autors Affiliation: Dipartimento di Fisica, Torino Politecnico, Corso Duca degli Abruzzi 24, I-10129 Torino, Italy; Dipartimento di Fisica, Universita degli Studi di Parma and CNR-INFM, Parco Area delle Scienze 7/a, I-43100 Parma, Italy

Abstract: In the present communication, we describe the properties induced by disorder on an ultracold gas of bosonic atoms loaded into a two-dimensional optical lattice with global confinement ensured by a parabolic potential. Our analysis is centred on the spatial distribution of the various phases, focusing particularly on the superfluid properties of the system as a function of external parameters and disorder amplitude. In particular, it is shown how disorder can suppress superfluidity, while partially preserving the system coherence.

Journal/Review: JOURNAL OF PHYSICS B-ATOMIC MOLECULAR AND OPTICAL PHYSICS

Volume: 40 (17)      Pages from: F265  to: F273

More Information: Fast-track communication
KeyWords: ultracold atoms; optical lattices; disordered system; superfluidity;
DOI: 10.1088/0953-4075/40/17/F02

Citations: 9
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