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 کاملDynamical spin response functions for Heisenberg ladders
We present the results of a numerical study of the 2 3L spin1 2 Heisenberg ladder. Ground state energies and the singlet-triplet energy gaps for 4<L<14 and J' /J uu 5 1 were obtained in a Lanczos calculation and checked against earlier calculations by Barnes et al. ~even L< 12!. A related moments technique is then employed to evaluate spin response functions for L 5 12 and a range of J' /J uu ~...
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.
متن کاملAnomalous magnetization process in frustrated spin ladders
We study, at T = 0, the anomalies in the magnetization curve of the S = 1 two-leg ladder with frustrated interactions. We focus mainly on the existence of the M = Ms/2 plateau, where Ms is the saturation magnetization. We reports the results by degenerate perturbation theory and and the density matrix renormalization group, which lead to the consistent conclusion with each other. We also touch ...
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 کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: Physical Review Letters
سال: 1997
ISSN: 0031-9007,1079-7114
DOI: 10.1103/physrevlett.78.2457