Network models of quantum percolation and their field-theory representations
- 15 October 1994
- journal article
- research article
- Published by American Physical Society (APS) in Physical Review B
- Vol. 50 (15), 10788-10791
- https://doi.org/10.1103/physrevb.50.10788
Abstract
We obtain the field-theory representations of several network models that are relevant to two-dimensional transport in high magnetic fields. Among them, the simplest one, which is relevant to the plateau transition in the quantum Hall effect, is equivalent to a particular representation of an antiferromagnetic SU(2N) (N→0) spin chain. Since the latter can be mapped onto a θ≠0, U(2N)/U(N)×U(N) σ model, and since recent numerical analyses of the corresponding network give a delocalization transition with ν≊2.3, we conclude that the same exponent is applicable to the σ model.Keywords
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This publication has 26 references indexed in Scilit:
- Global phase diagram in the quantum Hall effectPhysical Review B, 1992
- Current carrying states in the lowest Landau levelPhysical Review Letters, 1992
- Nonuniversal Delocalization in a Strong Magnetic FieldEurophysics Letters, 1990
- One-parameter scaling in the lowest Landau band: Precise determination of the critical behavior of the localization lengthPhysical Review Letters, 1990
- Experiments on Delocalization and University in the Integral Quantum Hall EffectPhysical Review Letters, 1988
- Universal Singularities in the Integral Quantum Hall EffectPhysical Review Letters, 1988
- Anisotropic Heisenberg chain with composite spinPhysical Review B, 1986
- Quantized Hall conductance, current-carrying edge states, and the existence of extended states in a two-dimensional disordered potentialPhysical Review B, 1982
- Inverse participation ratio in 2+? dimensionsZeitschrift für Physik B Condensed Matter, 1980
- Dynamical symmetry breaking in asymptotically free field theoriesPhysical Review D, 1974