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  • Title: Quantum phase transition in the sub-Ohmic spin-boson model: quantum Monte Carlo study with a continuous imaginary time cluster algorithm.
    Author: Winter A, Rieger H, Vojta M, Bulla R.
    Journal: Phys Rev Lett; 2009 Jan 23; 102(3):030601. PubMed ID: 19257337.
    Abstract:
    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 Jomega proportional, variant omegas 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.
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