Phys. Rev. Lett. 93, 097201 (2004) [4 pages]Exotic Versus Conventional Scaling and Universality in a Disordered Bilayer Quantum Heisenberg AntiferromagnetReceived 18 February 2004; published 23 August 2004 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. © 2004 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.93.097201
DOI:
10.1103/PhysRevLett.93.097201
PACS:
75.40.Mg, 75.10.Jm, 75.10.Nr
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