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Title

Strong electronic correlation in the hydrogen chain: A variational Monte Carlo study

AuthorsStella, Lorenzo; Attaccalite, Claudio; Sorella, Sandro; Rubio, Angel
Issue Date2011
PublisherAmerican Physical Society
CitationPhysical Review B 84(24): 245117 (2011)
AbstractIn this paper, we report a fully ab initio variational Monte Carlo study of the linear and periodic chain of hydrogen atoms, a prototype system providing the simplest example of strong electronic correlation in low dimensions. In particular, we prove that numerical accuracy comparable to that of benchmark density-matrix renormalization-group calculations can be achieved by using a highly correlated Jastrow-antisymmetrized geminal power variational wave function. Furthermore, by using the so-called “modern theory of polarization” and by studying the spin-spin and dimer-dimer correlations functions, we have characterized in detail the crossover between the weakly and strongly correlated regimes of this atomic chain. Our results show that variational Monte Carlo provides an accurate and flexible alternative to highly correlated methods of quantum chemistry which, at variance with these methods, can be also applied to a strongly correlated solid in low dimensions close to a crossover or a phase transition.
Publisher version (URL)http://dx.doi.org/10.1103/PhysRevB.84.245117
URIhttp://hdl.handle.net/10261/50868
DOI10.1103/PhysRevB.84.245117
Identifiersdoi: 10.1103/PhysRevB.84.245117
issn: 1098-0121
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