منابع مشابه
Weakly disordered spin ladders
We analyze an anisotropic spin 1/2 two legs ladder in the presence of various type of random perturbations. The generic phase diagram for the pure system, in a way similar to spin one chains, consists of four phases: an Antiferromagnet, a Haldane gap or a Singlet phase (depending on the sign of interchain coupling) and two XY phases designated by XY1 and XY2. The effects of disorder depend cruc...
متن کاملExactly Solvable Models of Generalized Spin Ladders
We study S = 1 2 spin ladder systems with isotropic exchange interactions between spins on neighboring rungs. We show that a ladder with suitable diagonal and biquadratic interactions is integrable in the sense that the quantum Yang-Baxter equation holds and one has an infinite number of conserved quantities. We give the R-matrix and L-operator associated with the ladder model. The model can be...
متن کاملDynamics of snakes and ladders.
D. J. Field, A. Hayes, and R. F. Hess (1993) introduced two types of stimulus to study the perceptual integration of contours. Both types of stimulus consist of a smooth path of spatially separate elements, embedded in a field of randomly oriented elements. In one type of stimulus ("snakes"), the elements form tangents to the path of the contour; in the other type ("ladders"), the elements are ...
متن کاملRaman cross section of spin ladders
We demonstrate that a two-triplet resonance strongly renormalizes the Raman spectrum of two-leg spin-ladders and moreover suggest this to be the origin of the asymmetry of the magnetic Raman continuum observed in CaV2O5. PACS. 78.30.-j Infrared and Raman spectra – 75.10.Jm Quantized spin models – 75.50.Ee Antiferromagnetics Magnetic Raman scattering is a powerful tool to investigate the total s...
متن کاملExactly Solvable Su(n ) Mixed Spin Ladders *
It is shown that solvable mixed spin ladder models can be constructed from su(N) permutators. Heisenberg rung interactions appear as chemical potential terms in the Bethe Ansatz solution. Explicit examples given are a mixed spin-1 2 spin-1 ladder, a mixed spin-1 2 spin-3 2 ladder and a spin-1 ladder with biquadratic interactions.
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ژورنال
عنوان ژورنال: Physical Review B
سال: 1998
ISSN: 0163-1829,1095-3795
DOI: 10.1103/physrevb.57.12832