Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
2004-11-28
Phys. Rev. B 72, 012416 (2005)
Physics
Condensed Matter
Strongly Correlated Electrons
10 pages, 1 figure
Scientific paper
10.1103/PhysRevB.72.012416
We suggest a family of spin-ladder models with exact singlet-rung vacuum. In addition to the terms describing interactions along legs and rungs the Hamiltonian has frustration and cyclic terms. Using coordinate Bethe ansatze all one- and two-dimensional states are constructed. The explicit formula for zero-temperature Raman scattering cross section is derived. The corresponding line-shapes are strongly asymmetric and have no more than one van-Hove singularity. The results are in good agreement with experimental data.
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