title: Influence of super-ohmic dissipation on a disordered quantum critical point.
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 super-ohmic 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.
authors.affiliation: Department of Physics, Missouri University of Science and Technology, Rolla, MO 65409, USA.
authors.forename: Thomas
authors.initials: T
authors.lastname: Vojta
authors.forename: José A
authors.initials: JA
authors.lastname: Hoyos
authors.forename: Priyanka
authors.initials: P
authors.lastname: Mohan
authors.forename: Rajesh
authors.initials: R
authors.lastname: Narayanan