A microscopic study of the groundstate properties and excitation spectrum of an interacting Bose system using the combined method relating correlatedbasisfunctions and the canonical transformations
Abstract
Previously, Wong and Fung proposed a microscopic theory which combines the methods of the CorrelatedBasisFunctions and the canonical transformation approach in studying a manyboson system. Using a model potential function which satisfies certain criteria, a onetoone mapping between real and quasiparticle spaces exists. We have expressed the explicit forms of the relevant transformation matrix elements in terms of the twoparticle correlation function. Using our special model for the twoparticle potential function, we calculate the groundstate properties and the lowlying excitation spectrum of a Bose system with liquid helium density and report that numerical results agree reasonably well with experimental data.
 Publication:

Physica A Statistical Mechanics and its Applications
 Pub Date:
 October 1986
 DOI:
 10.1016/03784371(86)900270
 Bibcode:
 1986PhyA..138..456W