Disorder Induced Quantum Phase Transition in Random-Exchange Spin-1/2 Chains

Abstract

We investigate the effect of quenched bond-disorder on the anisotropic spin-1/2 (XXZ) chain as a model for disorder induced quantum phase transitions. We find non-universal behavior of the average correlation functions for weak disorder, followed by a quantum phase transition into a strongly disordered phase with only short-range xy-correlations. We find no evidence for the universal strong-disorder fixed point predicted by the real-space renormalization group, suggesting a qualitatively different view of the relationship between quantum fluctuations and disorder.

4 pages, 4 postscript figures, needs RevTeX 4

References in corpus (2)

• Disorder induced cross-over effects at quantum critical points
• Breakdown of the perturbative renormalization group for S >= 1 random antiferromagnetic spin chains

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• Disorder Induced Phases in Higher Spin Antiferromagnetic Heisenberg Chains
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