Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
1998-12-23
Physics
Condensed Matter
Strongly Correlated Electrons
RevTeX, 17 pages, 6 embedded figures, uses epsfig
Scientific paper
10.1103/PhysRevB.60.329
We investigate the influence of biquadratic exchange interactions on the low-lying excitations of a S=1/2-ladder using perturbation theory, numerical diagonalization of finite systems and exact results for ladders with matrix product ground states. We consider in particular the combination of biquadratic exchange interactions corresponding to ring exchange on the basic ladder plaquette. We find that a moderate amount of ring exchange reduces the spin gap substantially and makes equal bilinear exchange on legs and rungs consistent with experimentally observed spectra.
Brehmer S.
Mikeska Hans-J"urgen
Mueller Marcus
Nagaosa Naoto
Uchida Satoko
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