title: Effects of dissipation on a quantum critical point with disorder.
abstract: We study the effects of dissipation on a disordered quantum phase transition with O(N) order-parameter symmetry by applying a strong-disorder renormalization group to the Landau-Ginzburg-Wilson field theory of the problem. We find that Ohmic dissipation results in a nonperturbative infinite-randomness critical point with unconventional activated dynamical scaling while super-Ohmic damping leads to conventional behavior. We discuss applications to the superconductor-metal transition in nanowires and to the Hertz theory of the itinerant antiferromagnetic transition.
authors.affiliation: Department of Physics, University of Missouri-Rolla, Rolla, Missouri 65409, USA.
authors.forename: José A
authors.initials: JA
authors.lastname: Hoyos
authors.forename: Chetan
authors.initials: C
authors.lastname: Kotabage
authors.forename: Thomas
authors.initials: T
authors.lastname: Vojta