期刊
JOURNAL OF PHYSICS-CONDENSED MATTER
卷 23, 期 9, 页码 -出版社
IOP PUBLISHING LTD
DOI: 10.1088/0953-8984/23/9/094206
关键词
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资金
- NSF [DMR-0339147, PHY-0551164, DMR-0906566]
- Research Corporation
- FAPESP [2010/03749-4]
- CNPq [302301/2009-7]
- DST [PHY/10-11/232/DSTX/ALAK]
- Direct For Mathematical & Physical Scien
- Division Of Materials Research [0906566] Funding Source: National Science Foundation
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 super-ohmic 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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