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Influence of superohmic dissipation on a disordered quantum critical point

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arxiv 1008.1106 v2 pith:UL4LJP4D submitted 2010-08-06 cond-mat.str-el

Influence of superohmic dissipation on a disordered quantum critical point

Thomas Vojta , J. A. Hoyos , Priyanka Mohan , Rajesh Narayanan This is my paper
classification cond-mat.str-el
keywords criticaldissipationdeterminedynamicalinfluencepointquantumsuperohmic
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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 superohmic 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.

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