A one-dimensional supersymmetric tz.sbnd;Jz.sbnd;type model is studied which permits the exact solution in the form of the Gutzwiller wave function. The model realizes a Fermi-liquid state with a discontinuity in the momentum distribution. It is found that the size-dependence of spin and charge susceptibilities enters only through the size-dependent transfer energy. A set of excited states which includes both spin and charge excitations is identified by the variational Monte Carlo method in which eigenstates show no fluctuations of energy.
ASJC Scopus subject areas
- Condensed Matter Physics