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Variational Solution of the One-Dimensional T-J Model

Gulacsi, Miklos

Description

A new variational scheme based on a modified Bethe-Peierls method is used to study the ground state properties of the one-dimensional t-J model. Expectation values are evaluated by cutting out a four-site cluster from a correlated Fermi sea, the ground state of which is described by a variational trial wave function. We study a generalized Gutzwiller state where nearest-neighbour hole-hole correlations are controlled variationally. From the electron concentration dependence of the ground state...[Show more]

dc.contributor.authorGulacsi, Miklos
dc.date.accessioned2015-12-13T22:49:11Z
dc.date.available2015-12-13T22:49:11Z
dc.identifier.issn0950-0839
dc.identifier.urihttp://hdl.handle.net/1885/80423
dc.description.abstractA new variational scheme based on a modified Bethe-Peierls method is used to study the ground state properties of the one-dimensional t-J model. Expectation values are evaluated by cutting out a four-site cluster from a correlated Fermi sea, the ground state of which is described by a variational trial wave function. We study a generalized Gutzwiller state where nearest-neighbour hole-hole correlations are controlled variationally. From the electron concentration dependence of the ground state energy, we determine the true thermodynamic boundary where segregation into an electron-rich, and purely hole phase sets in. We also determine the spinodal line and pair susceptibilities. The variational method is applied also to an extended t-J-V model, where V is the coupling constant of the charge interaction term.
dc.publisherTaylor & Francis Group
dc.sourcePhilosophical Magazine Letters
dc.subjectKeywords: Approximation theory; Electronic structure; Fermi level; Mathematical models; Maxwell equations; Phase separation; Statistical mechanics; Thermodynamics; Gutzwiller approximation; Thermodynamic limit; Wave functions; Ground state
dc.titleVariational Solution of the One-Dimensional T-J Model
dc.typeJournal article
local.description.notesImported from ARIES
local.description.refereedYes
local.identifier.citationvolume84
dc.date.issued2004
local.identifier.absfor020404 - Electronic and Magnetic Properties of Condensed Matter; Superconductivity
local.identifier.ariespublicationMigratedxPub8683
local.type.statusPublished Version
local.contributor.affiliationGulacsi, Miklos, College of Physical and Mathematical Sciences, ANU
local.bibliographicCitation.issue10
local.bibliographicCitation.startpage607
local.bibliographicCitation.lastpage623
local.identifier.doi10.1080/09500830512331325073
dc.date.updated2015-12-11T10:32:55Z
local.identifier.scopusID2-s2.0-11344285047
CollectionsANU Research Publications

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