Phase diagram for ultracold bosons in optical lattices and superlattices
Year: 2004
Authors: Buonsante P., Vezzani A.
Autors Affiliation: Dipartimento di Fisica, Politecnico di Torino and INFM, Corso Duca degli Abruzzi 24, I-10129 Torino, Italy; Dipartimento di Fisica, Universit�� degli Studi di Parma and INFM, Parco Area delle Scienze 7�Ma, I-43100 Parma, Italy
Abstract: We present an analytic description of the finite-temperature phase diagram of the Bose-Hubbard model, successfully describing the physics of cold bosonic atoms trapped in optical lattices and superlattices. Based on a standard statistical mechanics approach, we provide the exact expression for the boundary between the superfluid and the normal fluid by solving the self-consistency equations involved in the mean-field approximation to the Bose-Hubbard model. The zero-temperature limit of such a result supplies an analytic expression for the Mott lobes of superlattices, characterized by a critical fractional filling.
Journal/Review: PHYSICAL REVIEW A
Volume: 70 (3) Pages from: 033608-1 to: 033608-8
KeyWords: ultracold atoms; optical lattices; superlattices; quantum phase transitions;
DOI: 10.1103/PhysRevA.70.033608
ImpactFactor: 2.902
Citations: 80
data from “WEB OF SCIENCE” (of Thomson Reuters) are update at: 2025-06-29
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