Dissipation Effects in Percolating Quantum Ising Magnets
We study the effects of dissipation on a randomly dilute transverse-field Ising magnet at and close to the percolation threshold. For weak transverse fields, a novel percolation quantum phase transition separates a super-paramagnetic cluster phase from an inhomogeneously ordered ferromagnetic phase. The properties of this transition are dominated by large frozen and slowly fluctuating percolation clusters. Implementing numerically a strong-disorder real space renormalization group technique, we compute the low-energy density of states which is found to be in good agreement with the analytical prediction.
J. A. Hoyos and T. Vojta, "Dissipation Effects in Percolating Quantum Ising Magnets," Physica B: Condensed Matter, Elsevier, Apr 2008.
The definitive version is available at http://dx.doi.org/10.1016/j.physb.2007.10.260
National Science Foundation (U.S.)
Keywords and Phrases
Disordered Systems; Dissipation; Quantum Phase Transition; Percolation
Article - Journal
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