Exotic vs. . . Conventional Scaling and Universality in a Disordered Bilayer Quantum Heisenberg Antiferromagnet
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We present Monte Carlo simulations of a two-dimensional bilayer quantum Heisenberg antiferromagnet with random dimer dilution. In contrast with exotic scaling scenarios found in 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 corrections to scaling, with a leading irrelevant exponent of ω≈0.48, we find universal critical exponents z=1.310(6) and ν=1.16(3). We discuss the consequences of these findings and suggest new experiments.