Phys. Rev. Lett. 99, 230601 (2007) [4 pages]Effects of Dissipation on a Quantum Critical Point with DisorderReceived 19 May 2007; published 4 December 2007 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. © 2007 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.99.230601
DOI:
10.1103/PhysRevLett.99.230601
PACS:
64.60.Ht, 75.10.Lp, 75.10.Nr, 75.40.−s
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