Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
2004-02-13
Phys. Rev. Lett. 93, 097201 (2004)
Physics
Condensed Matter
Strongly Correlated Electrons
4 pages, 5eps figures included, final version as published
Scientific paper
10.1103/PhysRevLett.93.097201
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 \omega = 0.48, we find universal, i.e., disorder-independent, critical exponents z=1.310(6) and \nu=1.16(3). We discuss the consequences of these findings and suggest new experiments.
Sknepnek Rastko
Vojta Matthias
Vojta Thomas
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