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Article: Theory of Gossamer and resonating valence bond superconductivity

TitleTheory of Gossamer and resonating valence bond superconductivity
Authors
KeywordsPhysics
Issue Date2005
PublisherAmerican Physical Society. The Journal's web site is located at http://prb.aps.org/
Citation
Physical Review B - Condensed Matter And Materials Physics, 2005, v. 71 n. 1 How to Cite?
AbstractWe use an effective Hamiltonian for two-dimensional Hubbard model including an antiferromagnetic spin-spin coupling term to study recently proposed Gossamer superconductivity. We apply a renormalized mean field theory to approximately take into account the strong correlation effect in partially projected Gutzwiller wave functions. At the half-filling, there is a first order phase transition to separate a Mott insulator at large Coulomb repulsion U from a Gossamer superconductor at small U. At the critical value U = U c, the charge carrier density and the superconducting (SC) order parameter change discontinuously from zero in the Mott insulating phase to finite values in the Gossamer SC phase. The first order transition is due to the interplay of the kinetic and spin exchange energies. As the electron density changes away from half-filling, the Gossamer SC state changes smoothly, while the Mott insulator is evolved into a resonating valence bond (RVB) SC state. The Gossamer and RVB SC states have the same pairing symmetry. The SC order parameter changes smoothly from a RVB SC state at U > U c to a Gossamer SC state at U < U c at a fixed nonhalf-filled electron density. We argue that the RVB SC state is smoothly connected to the Gossamer SC state, hence to the BCS state. © 2005 The American Physical Society.
Persistent Identifierhttp://hdl.handle.net/10722/43446
ISSN
2014 Impact Factor: 3.736
2015 SCImago Journal Rankings: 1.933
ISI Accession Number ID
References

 

DC FieldValueLanguage
dc.contributor.authorGan, JYen_HK
dc.contributor.authorZhang, FCen_HK
dc.contributor.authorSu, ZBen_HK
dc.date.accessioned2007-03-23T04:45:51Z-
dc.date.available2007-03-23T04:45:51Z-
dc.date.issued2005en_HK
dc.identifier.citationPhysical Review B - Condensed Matter And Materials Physics, 2005, v. 71 n. 1en_HK
dc.identifier.issn1098-0121en_HK
dc.identifier.urihttp://hdl.handle.net/10722/43446-
dc.description.abstractWe use an effective Hamiltonian for two-dimensional Hubbard model including an antiferromagnetic spin-spin coupling term to study recently proposed Gossamer superconductivity. We apply a renormalized mean field theory to approximately take into account the strong correlation effect in partially projected Gutzwiller wave functions. At the half-filling, there is a first order phase transition to separate a Mott insulator at large Coulomb repulsion U from a Gossamer superconductor at small U. At the critical value U = U c, the charge carrier density and the superconducting (SC) order parameter change discontinuously from zero in the Mott insulating phase to finite values in the Gossamer SC phase. The first order transition is due to the interplay of the kinetic and spin exchange energies. As the electron density changes away from half-filling, the Gossamer SC state changes smoothly, while the Mott insulator is evolved into a resonating valence bond (RVB) SC state. The Gossamer and RVB SC states have the same pairing symmetry. The SC order parameter changes smoothly from a RVB SC state at U > U c to a Gossamer SC state at U < U c at a fixed nonhalf-filled electron density. We argue that the RVB SC state is smoothly connected to the Gossamer SC state, hence to the BCS state. © 2005 The American Physical Society.en_HK
dc.format.extent141378 bytes-
dc.format.extent26112 bytes-
dc.format.mimetypeapplication/pdf-
dc.format.mimetypeapplication/msword-
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.rightsPhysical Review B (Condensed Matter and Materials Physics). Copyright © American Physical Society.en_HK
dc.rightsCreative Commons: Attribution 3.0 Hong Kong License-
dc.subjectPhysicsen_HK
dc.titleTheory of Gossamer and resonating valence bond superconductivityen_HK
dc.typeArticleen_HK
dc.identifier.openurlhttp://library.hku.hk:4550/resserv?sid=HKU:IR&issn=1098-0121&volume=71&issue=1&spage=014508:1&epage=9&date=2005&atitle=Theory+of+Gossamer+and+resonating+valence+bond+superconductivityen_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.71.014508en_HK
dc.identifier.scopuseid_2-s2.0-16844370137en_HK
dc.identifier.hkuros97056-
dc.relation.referenceshttp://www.scopus.com/mlt/select.url?eid=2-s2.0-16844370137&selection=ref&src=s&origin=recordpageen_HK
dc.identifier.volume71en_HK
dc.identifier.issue1en_HK
dc.identifier.isiWOS:000226735100134-
dc.publisher.placeUnited Statesen_HK
dc.identifier.scopusauthoridGan, JY=16024720900en_HK
dc.identifier.scopusauthoridZhang, FC=14012468800en_HK
dc.identifier.scopusauthoridSu, ZB=7402248667en_HK

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