SU(N) Evolution of a Frustrated Spin Ladder
arXiv:cond-mat/0305194 · doi:10.1103/PhysRevB.68.094405
Abstract
Recent studies indicate that the weakly coupled spin-1/2 Heisenberg antiferromagnet with next nearest neighbor frustration supports massive spinons when suitably tuned. The straightforward SU(N) generalization of the low energy ladder Hamiltonian yields two independent SU(N) Thirring models with N-1 multiplets of massive ``spinon'' excitations. We study the evolution of the complete set of low-energy dynamical structure factors using form factors. Those corresponding to the smooth (staggered) magnetizations are qualitatively different (the same) in the N=2 and N>2 cases. The absence of single-particle peaks preserves the notion of spinons stabilized by frustration. In contrast to the ladder, we note that the N=infinity limit of the four chain magnet is not a trivial free theory.
10 pages, RevTex, 5 figures; SU(N) approach clarified
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Cited by in corpus (8)
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- Dynamical Spin Response of Doped Two-Leg Hubbard-like Ladders
- The nested SU(N) off-shell Bethe ansatz and exact form factors
- Dynamical response functions in the quantum Ising chain with a boundary
- Frustrated mixed-spin ladders: Evidence for a bond order wave phase between rung-singlet and Haldane phases
- Second Quantized Reduced Bloch Equations and the Exact Solutions for Pairing Hamiltonian