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Dynamical correlations in a Hubbard chain with resonating-valence-bond ground state

Andreas Giesekus
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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.

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Andreas Giesekus. 1995-04-24. Dynamical correlations in a Hubbard chain with resonating-valence-bond ground state. https://doi.org/10.1103/physrevb.52.2476

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