A microscopic study of the ground-state properties and excitation spectrum of an interacting Bose system using the combined method relating correlated-basis-functions and the canonical transformations

K.W. Wong, W.K. Chow and P.C.W. Fung

Physica A: Statistical Mechanics and its Applications, 1986, vol. 138, issue 3, 456-489

Abstract: Previously, Wong and Fung proposed a microscopic theory which combines the methods of the Correlated-Basis-Functions and the canonical transformation approach in studying a many-boson system. Using a model potential function which satisfies certain criteria, a one-to-one mapping between real- and quasi-particle spaces exists. We have expressed the explicit forms of the relevant transformation matrix elements in terms of the two-particle correlation function. Using our special model for the two-particle potential function, we calculate the ground-state properties and the low-lying excitation spectrum of a Bose system with liquid helium density and report that numerical results agree reasonably well with experimental data.

Date: 1986
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Persistent link: https://EconPapers.repec.org/RePEc:eee:phsmap:v:138:y:1986:i:3:p:456-489

DOI: 10.1016/0378-4371(86)90027-0

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