Stolze, JoachimHamacher, KayWenzel, Wolfgang2008-06-062008-06-062002-08-28Hamacher, 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.http://hdl.handle.net/2003/25450http://dx.doi.org/10.17877/DE290R-2804We 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.en©2002 The American Physical Society530Text10.1103/PhysRevLett.89.127202http:/dx.doi.org/10.1103/PhysRevLett.89.127202