Elementary excitations in the gapped phase of a frustratedS= 1/2 spin ladder: from spinons to the Haldane triplet

1997/10/13 by S. Brehmer, A. K. Kolezhuk, H. -J. Mikeska +3 · 5 citations
Chemistry · Physics and Astronomy · #Advanced Condensed Matter Physics #Advanced NMR Techniques and Applications #Physics of Superconductivity and Magnetism #cond-mat.str-el

paper · pdf · doi:10.1088/0953-8984/10/5/017

published as J. Phys.: Condens. Matter v.10, 1103-1116 (1998) · RevTeX, 13 pages, 11 embedded figures, uses psfig and multicol

arxiv created 1997/10/13 · openalex publication_date 1998/02/09 · arxiv updated 2009/11/30 · openalex created_date 2016/06/24 · openalex updated_date 2026/07/30

Abstract

We use the variational matrix-product ansatz to study elementary excitations in the ladder with additional diagonal coupling, equivalent to a single chain with alternating exchange and next-nearest-neighbour interaction. In the absence of alternation, the elementary excitation consists of two free particles (`spinons') which are solitons in the dimer order. When the nearest-neighbour exchange alternates, the `spinons' are confined into one S = 1 excitation which is a soliton in the generalized string order. The variational results are found to be in qualitative agreement with the exact-diagonalization data for 24 spins. We argue that such an approach gives a reasonably good description over a wide range of the model parameters.

Citations

• Range of order in antiferromagnets with next-nearest neighbor coupling

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