Phys. Rev. Lett. 95, 067202 (2005) [4 pages]Numerical Renormalization-Group Study of the Bose-Fermi Kondo ModelReceived 24 January 2005; published 4 August 2005 We extend the numerical renormalization-group method to Bose-Fermi Kondo models (BFKMs), describing a local moment coupled to a conduction band and a dissipative bosonic bath. We apply the method to the Ising-symmetry BFKM with a bosonic bath spectral function η(ω)∝ωs, of interest in connection with heavy-fermion criticality. For 0<s<1, an interacting critical point, characterized by hyperscaling of exponents and ω/T scaling, describes a quantum phase transition between Kondo-screened and localized phases. A connection is made to other results for the BFKM and the spin-boson model. © 2005 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.95.067202
DOI:
10.1103/PhysRevLett.95.067202
PACS:
75.20.Hr, 05.10.Cc, 71.10.Hf, 71.27.+a
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