Variational solution of the one-dimensional t–J model

Autor:	Miklos Gulacsi
Rok vydání:	2004
Předmět:	Coupling constant Spinodal symbols.namesake Variational method Chemistry Quantum mechanics t-J model Thermodynamic limit Fermi level symbols Condensed Matter Physics Ground state Wave function
Zdroj:	Philosophical Magazine Letters. 84:607-623
ISSN:	1362-3036 0950-0839
DOI:	10.1080/09500830512331325073
Popis:	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 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.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::3d9d66ed4b88698cfb462178d59438ac https://doi.org/10.1080/09500830512331325073 Zobrazit plný text záznamu Plný text ve formátu PDF Plný text ve formátu HTML
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