Dynamical correlations in a Hubbard chain with resonating-valence-bond ground state
Abstract
Dynamical correlation functions for temperature T=0 are calculated for a Hubbard chain with infinite on-site repulsion. This chain contains three sites per unit cell and has a known resonating-valence-bond ground state for a filling of 2 particles per unit cell. A finite system of 24 sites is studied numerically. The recursion method is applied and results for spectral densities are compared to variationally calculated excited-state eigenvalues. Charge and spin degrees of freedom located at the backbone sites are considered. The spectral densities show dispersionless excitations. The energy spectrum displays a gap indicating an insulating ground state. Spectral functions for the propagation of a single hole in a resonating-valence-bond background are provided and indicate delocalized dispersive hole excitations.
Keywords
Cite
@article{arxiv.cond-mat/9504087,
title = {Dynamical correlations in a Hubbard chain with resonating-valence-bond ground state},
author = {Andreas Giesekus},
journal= {arXiv preprint arXiv:cond-mat/9504087},
year = {2009}
}
Comments
19 pages, RevTeX 3.0, 6 postscript figures appended as uuencoded compressed file