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Article: Mott insulator-superfluid transitions in a two-band model at finite temperature and possible application to supersolid He4

TitleMott insulator-superfluid transitions in a two-band model at finite temperature and possible application to supersolid He4
Authors
KeywordsPhysics
Issue Date2007
PublisherAmerican Physical Society. The Journal's web site is located at http://prb.aps.org/
Citation
Physical Review B - Condensed Matter And Materials Physics, 2007, v. 76 n. 17 How to Cite?
AbstractWe study the Mott insulator-superfluid transition in a two-band boson Hubbard model, which can be mapped onto a spin- 1 2 XY model with spins coupled to an additional Ising degree of freedom. By using a modified mean field theory that includes the effects of phase fluctuations, we show that the transition is first order at both zero and finite temperatures. On the Mott insulator side, there may be reentrance in phase transition. These features are consequences of the underlying transition between competing defect poor and defect rich phases. The possible relevance of the model and our results to supersolid He4 and cold bosonic atoms in optical lattices are discussed. © 2007 The American Physical Society.
Persistent Identifierhttp://hdl.handle.net/10722/57329
ISSN
2014 Impact Factor: 3.736
2015 SCImago Journal Rankings: 1.933
ISI Accession Number ID
References

 

DC FieldValueLanguage
dc.contributor.authorZhuang, HBen_HK
dc.contributor.authorMa, Men_HK
dc.contributor.authorDai, Xen_HK
dc.contributor.authorZhang, FCen_HK
dc.date.accessioned2010-04-12T01:33:18Z-
dc.date.available2010-04-12T01:33:18Z-
dc.date.issued2007en_HK
dc.identifier.citationPhysical Review B - Condensed Matter And Materials Physics, 2007, v. 76 n. 17en_HK
dc.identifier.issn1098-0121en_HK
dc.identifier.urihttp://hdl.handle.net/10722/57329-
dc.description.abstractWe study the Mott insulator-superfluid transition in a two-band boson Hubbard model, which can be mapped onto a spin- 1 2 XY model with spins coupled to an additional Ising degree of freedom. By using a modified mean field theory that includes the effects of phase fluctuations, we show that the transition is first order at both zero and finite temperatures. On the Mott insulator side, there may be reentrance in phase transition. These features are consequences of the underlying transition between competing defect poor and defect rich phases. The possible relevance of the model and our results to supersolid He4 and cold bosonic atoms in optical lattices are discussed. © 2007 The American Physical Society.en_HK
dc.languageengen_HK
dc.publisherAmerican Physical Society. The Journal's web site is located at http://prb.aps.org/en_HK
dc.relation.ispartofPhysical Review B - Condensed Matter and Materials Physicsen_HK
dc.rightsCreative Commons: Attribution 3.0 Hong Kong License-
dc.rightsPhysical Review B (Condensed Matter and Materials Physics). Copyright © American Physical Society.en_HK
dc.subjectPhysicsen_HK
dc.titleMott insulator-superfluid transitions in a two-band model at finite temperature and possible application to supersolid He4en_HK
dc.typeArticleen_HK
dc.identifier.openurlhttp://library.hku.hk:4550/resserv?sid=HKU:IR&issn=1098-0121&volume=76&issue=17&spage=174504&epage=1 &date=2007&atitle=Mott+insulator-superfluid+transitions+in+a+two-band+model+at+finite+temperature+and+possible+application+to+supersolid+4Heen_HK
dc.identifier.emailZhang, FC: fuchun@hkucc.hku.hken_HK
dc.identifier.authorityZhang, FC=rp00840en_HK
dc.description.naturepublished_or_final_versionen_HK
dc.identifier.doi10.1103/PhysRevB.76.174504en_HK
dc.identifier.scopuseid_2-s2.0-35948999612en_HK
dc.identifier.hkuros152368-
dc.relation.referenceshttp://www.scopus.com/mlt/select.url?eid=2-s2.0-35948999612&selection=ref&src=s&origin=recordpageen_HK
dc.identifier.volume76en_HK
dc.identifier.issue17en_HK
dc.identifier.isiWOS:000251326600106-
dc.publisher.placeUnited Statesen_HK
dc.identifier.scopusauthoridZhuang, HB=36880044700en_HK
dc.identifier.scopusauthoridMa, M=7202445040en_HK
dc.identifier.scopusauthoridDai, X=55237280400en_HK
dc.identifier.scopusauthoridZhang, FC=14012468800en_HK

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