Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
1997-10-13
J. Phys.: Condens. Matter v.10, 1103-1116 (1998)
Physics
Condensed Matter
Strongly Correlated Electrons
RevTeX, 13 pages, 11 embedded figures, uses psfig and multicol
Scientific paper
10.1088/0953-8984/10/5/017
We use the variational matrix-product ansatz to study elementary excitations in the S=1/2 ladder with additional diagonal coupling, equivalent to a single S=1/2 chain with alternating exchange and next-nearest neighbor interaction. In absence of alternation the elementary excitation consists of two free S=1/2 particles ("spinons") which are solitons in the dimer order. When the nearest-neighbor exchange alternates, the "spinons" are confined into one S=1 excitation being a soliton in the generalized string order. Variational results are found to be in a qualitative agreement with the exact diagonalization data for 24 spins. We argue that such an approach gives a reasonably good description in a wide range of the model parameters.
Brehmer S.
Kolezhuk Alexei K.
Mikeska Hans-J"urgen
Neugebauer U.
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