$S=1-2$ Chain-Boundary Excitations in the Haldane Phase of 1D $S=1$ Systems

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The $s=1-2$ chain-boundary excitations occurring in the Haldane phaseof $s=1$ antiferromagnetic spin chains are investigated. The bilinear-biquadratic hamiltonian is used to study these excitations as a function of the strength of the biquadratic term, $\beta$, between $-1\le\beta\le1$. At the AKLT point, $\beta=-1-3$, we show explicitly that these

Autor: E. Polizzi; F. Mila; E. S. Sorensen

Fuente: https://archive.org/