Influence of superohmic dissipation on a disordered quantum critical point
Strongly Correlated Electrons
2011-02-18 v2
Abstract
We investigate the combined influence of quenched randomness and dissipation on a quantum critical point with O(N) order-parameter symmetry. Utilizing a strong-disorder renormalization group, we determine the critical behavior in one space dimension exactly. For superohmic dissipation, we find a Kosterlitz-Thouless type transition with conventional (power-law) dynamical scaling. The dynamical critical exponent depends on the spectral density of the dissipative baths. We also discuss the Griffiths singularities, and we determine observables.
Keywords
Cite
@article{arxiv.1008.1106,
title = {Influence of superohmic dissipation on a disordered quantum critical point},
author = {Thomas Vojta and J. A. Hoyos and Priyanka Mohan and Rajesh Narayanan},
journal= {arXiv preprint arXiv:1008.1106},
year = {2011}
}
Comments
12 pages, 2 eps figures included, final version as published in the "Strongly Correlated Electron Systems" special issue of Journal of Physics: Condensed Matter