Abstract

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.

Department(s)

Physics

Sponsor(s)

DFG Center for Functional Nanostructures Karlsruhe
National Science Foundation (U.S.)
University of Missouri Research Board

Keywords and Phrases

Monte Carlo Methods; Antiferromagnetic Materials; Hamiltonians; Phase Transitions; Random Processes; Computer simulation; Dimers; Fermions; Mathematical models; Parameter estimation

Document Type

Article - Journal

Document Version

Final Version

File Type

text

Language(s)

English

Rights

© 2004 American Physical Society (APS), All rights reserved.

Included in

Physics Commons

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