Physics – Condensed Matter – Statistical Mechanics
Scientific paper
2008-07-29
Phys.Rev.Lett.102:030601,2009
Physics
Condensed Matter
Statistical Mechanics
4 pages, 4 figures
Scientific paper
10.1103/PhysRevLett.102.030601
A continuous time cluster algorithm for two-level systems coupled to a dissipative bosonic bath is presented and applied to the sub-ohmic spin-Boson model. When the power s of the spectral function J(w) \propto w^s is smaller than 1/2, the critical exponents are found to be classical, mean-field like. Potential sources for the discrepancy with recent renormalization group predictions are traced back to the effect of a dangerously irrelevant variable.
Bulla Ralf
Rieger Heiko
Vojta Matthias
Winter Andre
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