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One-dimensional phase transitions in a two-dimensional optical lattice
KTH, School of Engineering Sciences (SCI), Theoretical Physics, Condensed Matter Theory.ORCID iD: 0000-0002-2076-5911
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2008 (English)In: European Physical Journal D: Atomic, Molecular and Optical Physics, ISSN 1434-6060, E-ISSN 1434-6079, Vol. 49, no 2, 223-230 p.Article in journal (Refereed) Published
Abstract [en]

A phase transition for bosonic atoms in a two-dimensional anisotropic optical lattice is considered. If the tunnelling rates in two directions are different, the system can undergo a transition between a two-dimensional superfluid and a one-dimensional Mott insulating array of strongly coupled tubes. The connection to other lattice models is exploited in order to better understand the phase transition. Critical properties are obtained using quantum Monte Carlo calculations. These critical properties are related to correlation properties of the bosons and a criterion for commensurate filling is established.

Place, publisher, year, edition, pages
2008. Vol. 49, no 2, 223-230 p.
Keyword [en]
bose-hubbard model, xy model, superfluid, atoms, mott, insulator, gases
URN: urn:nbn:se:kth:diva-17827DOI: 10.1140/epjd/e2008-00152-9ISI: 000259258800010ScopusID: 2-s2.0-52049123298OAI: diva2:335872
QC 20100525Available from: 2010-08-05 Created: 2010-08-05Bibliographically approved

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Rosengren, Anders
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