We show that the interplay of geometric criticality and quantum fluctuations leads to a novel universality class for the percolation quantum phase transition in diluted magnets. All critical exponents involving dynamical correlations are different from the classical percolation values, but in two dimensions they can nonetheless be determined exactly. We develop a complete scaling theory of this transition, and we relate it to recent experiments in La2Cu1-p(Zn,Mg)pO4. Our results are also relevant for disordered interacting boson systems.
T. Vojta and J. Schmalian, "Percolation Quantum Phase Transitions in Diluted Magnets," Physical Review Letters, American Physical Society (APS), Nov 2005.
The definitive version is available at http://dx.doi.org/10.1103/PhysRevLett.95.237206
Iowa State University
National Science Foundation (U.S.)
United States. Department of Energy
Keywords and Phrases
Condensed Matter; Strongly Correlated Electrons
Article - Journal
© 2005 American Physical Society (APS), All rights reserved.