Excitations in one-dimensional S=1/2 quantum antiferromagnets

Details Excitations in one-dimensional S=1/2 quantum antiferromagnets Excitations in one-dimensional S=1/2 quantum antiferromagnets

2002-11-27

arxiv.org/abs/cond-mat/0211627v2

Phys. Rev. Lett. 90, 227204 (2003)

Physics

Condensed Matter

Strongly Correlated Electrons

4 pages, 1 figure included

Scientific paper

10.1103/PhysRevLett.90.227204

The transition from dimerized to uniform phases is studied in terms of spectral weights for spin chains using continuous unitary transformations (CUTs). The spectral weights in the S=1 channel are computed perturbatively around the limit of strong dimerization. We find that the spectral weight is concentrated mainly in the subspaces with a small number of elementary triplets (triplons), even for vanishing dimerization. So, besides spinons, triplons may be used as elementary excitations in spin chains. We conclude that there is no necessity to use fractional excitations in low-dimensional, undoped or doped quantum antiferromagnets.

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