Disorder induced quantum phase transition in random-exchange spin-1/2 chains |
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Authors: | Hamacher K Stolze J Wenzel W |
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Affiliation: | Forschungszentrum Karlsruhe, Institut für Nanotechnologie, 76021 Karlsruhe, Germany. |
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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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