Disorder Induced Quantum Phase transitions in Random-Exchange Spin-1/2 Chains
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Date
2002-08-28
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The American Physical Society
Abstract
We investigate the effect of quenched bond disorder on the anisotropic antiferromagnetic spin-1/2 (XXZ) chain as a model for disorder-induced quantum phase transitions. We find nonuniversal 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.
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Hamacher, Kay; Stolze, Joachim; Wenzel, Wolfgang: Disorder Induced Quantum Phase transitions in Random-Exchange Spin-1/2 Chains. In: Physical Review Letters Nr. 12, Jg. 89(2002), 127202, doi: 10.1103/PhysRevLett.89.127202.