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dc.contributor.authorHetényi, B.en_US
dc.date.accessioned2016-02-08T09:43:13Z
dc.date.available2016-02-08T09:43:13Z
dc.date.issued2012en_US
dc.identifier.issn0031-9015
dc.identifier.urihttp://hdl.handle.net/11693/21217
dc.description.abstractThe linear response theory for current is investigated in a variational context. Expressions are derived for the Drude and superfluid weights for general variational wavefunctions. The expression for the Drude weight highlights the difficulty in its calculation since it depends on the exact energy eigenvalues which are usually not available in practice. While the Drude weight is not available in a simple form, the linear current response is shown to be expressible in terms of a geometric phase, or alternatively in terms of the expectation value of the total position shift operator. The contribution of the geometric phase to the current response is then analyzed for some commonly used projected variational wavefunctions (Baeriswyl, Gutzwiller, and combined). It is demonstrated that this contribution is independent of the projectors themselves and is determined by the wavefunctions onto which the projectors are applied.en_US
dc.language.isoEnglishen_US
dc.source.titleJournal of the Physical Society of Japanen_US
dc.relation.isversionofhttp://dx.doi.org/10.1143/JPSJ.81.124711en_US
dc.subjectDC conductivityen_US
dc.subjectGeometric phaseen_US
dc.subjectSuperfluid weighten_US
dc.titleCurrent response in extended systems as a geometric phase: Application to variational wavefunctionsen_US
dc.typeArticleen_US
dc.departmentDepartment of Physicsen_US
dc.citation.spage124711-1en_US
dc.citation.epage124711-5en_US
dc.citation.volumeNumber81en_US
dc.citation.issueNumber12en_US
dc.identifier.doi10.1143/JPSJ.81.124711en_US
dc.publisherJournal of the Physical Society of the Japanen_US
dc.identifier.eissn1347-4073


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