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 کاملBound states in weakly disordered spin ladders
We study the appearance of bound states in the spin gap of spin-1/2 ladders induced by weak bond disorder. Starting from the strong-coupling limit, i.e., the limit of weakly coupled dimers, we perform a projection on the single-triplet subspace and derive the position of bound states for the single impurity problem of one modified coupling as well as for small impurity clusters. The case of a f...
متن کاملSpin-catalyzed hopping conductivity in disordered strongly interacting quantum wires
S. A. Parameswaran1,2 and S. Gopalakrishnan2,3,4 1Department of Physics and Astronomy, University of California, Irvine, California 92697, USA 2Kavli Institute for Theoretical Physics, University of California, Santa Barbara, California 93106, USA 3Department of Physics and Burke Institute, California Institute of Technology, Pasadena, California 91125, USA 4Department of Engineering Science an...
متن کاملLarge moment formation and thermodynamic properties of disordered spin ladders with site dilution
Low temperature properties of antiferromagnetic two-leg spin-1/2 ladders with bond randomness and site dilution ~or doping with nonmagnetic impurities! are studied using the real-space renormalization-group technique. We find that for nonzero dopant concentrations the systems are driven into a phase dominated by large effective spins, i.e., the large spin phase. The susceptibility follows a uni...
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: 2002
ISSN: 0163-1829,1095-3795
DOI: 10.1103/physrevb.65.104415