Effects of dissipation on a quantum critical point with disorder |
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Authors: | Hoyos José A Kotabage Chetan Vojta Thomas |
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Affiliation: | Department of Physics, University of Missouri-Rolla, Rolla, Missouri 65409, USA. |
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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. |
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