Effects of dissipation on a quantum critical point with disorder

Details Effects of dissipation on a quantum critical point with disorder Effects of dissipation on a quantum critical point with disorder

2007-05-14

arxiv.org/abs/0705.1865v3

Phys. Rev. Lett. 99, 230601 (2007)

Physics

Condensed Matter

Strongly Correlated Electrons

4 pages, 1 figure, final version, as published

Scientific paper

10.1103/PhysRevLett.99.230601

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 non-perturbative infinite-randomness critical point with unconventional activated dynamical scaling while superohmic damping leads to conventional behavior. We discuss applications to the superconductor-metal transition in nanowires and to Hertz' theory of the itinerant antiferromagnetic transition.

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