Exotic vs. conventional scaling and universality in a disordered bilayer quantum Heisenberg antiferromagnet

Abstract

We present large-scale Monte-Carlo simulations of a two-dimensional (2d) bilayer quantum Heisenberg antiferromagnet with random dimer dilution. In contrast to the exotic scaling scenarios found in many other random quantum systems, the quantum phase transition in this system is characterized by a finite-disorder fixed point with power-law scaling. After accounting for strong corrections to scaling, characterized by a leading irrelevant exponent of ω= 0.48, we find universal, i.e., disorder-independent, critical exponents z=1.310(6) and ν=1.16(3). We discuss the consequences of these findings and suggest new experiments.

4 pages, 5eps figures included, final version as published

References in corpus (3)

• Disorder-induced rounding of certain quantum phase transitions
• Low-energy fixed points of random Heisenberg models
• Critical behavior of magnetic systems with extended impurities in general dimensions

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