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

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

1993-09-13

arxiv.org/abs/cond-mat/9309011v1

Physics

Condensed Matter

RevTex 3.0, 24 pages, 2 figures on request by fax or mail

Scientific paper

10.1088/0953-8984/5/48/009

We study low-lying excitations in the 1D $S=1$ antiferromagnetic valence-bond-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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