Series study of the One-dimensional S-T Spin-Orbital Model

Details Series study of the One-dimensional S-T Spin-Orbital Model Series study of the One-dimensional S-T Spin-Orbital Model

2001-01-18

arxiv.org/abs/cond-mat/0101273v1

Physics

Condensed Matter

Strongly Correlated Electrons

9 pages, 9 figures

Scientific paper

10.1103/PhysRevB.64.014410

We use perturbative series expansions about a staggered dimerized ground state to compute the ground state energy, triplet excitation spectra and spectral weight for a one-dimensional model in which each site has an $S=\case 1/2$ spin ${\bf S}_i$ and a pseudospin ${\bf T}_i$, representing a doubly degenerate orbital. An explicit dimerization is introduced to allow study of the confinement of spinon excitations. The elementary triplet represents a bound state of two spinons, and is stable over much of the Brillouine zone. A special line is found in the gapped spin-liquid phase, on which the triplet excitation is dispersionless. The formation of triplet bound states is also investigated.

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