Solitonic excitations in the Haldane phase of a $S=1$ chain

Fáth, Gábor and Sólyom, Jenő (1993) Solitonic excitations in the Haldane phase of a $S=1$ chain. JOURNAL OF PHYSICS-CONDENSED MATTER, 5. pp. 8983-8998. ISSN 0953-8984

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Abstract

We study low-lying excitations in the 1D S = 1 antiferromagnetic valencebond-solid (VBS) model. In a numerical calculation on finite systems the lowest excitations are found to form a discrete triplet branch, separated from the higher-lying continuum. The dispersion of these triplet excitations can be satisfactorily reproduced by assuming approximate wave functions. These wave functions are shown to correspond to moving hidden domain walls, i.e. to one-soliton excitations.

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