Phys. Rev. E 55, 6636–6640 (1997)Transition between quantum coherence and incoherenceReceived 14 February 1997; published in the issue dated June 1997 We show that a transformed Caldeira-Leggett Hamiltonian has two distinct families of fixed points rather than a single unique fixed point as often conjectured based on its connection to the anisotropic Kondo model. The two families are distinguished by a sharp qualitative difference in their quantum coherence properties and we argue that this distinction is best understood as the result of a transition in the model between degeneracy and nondegeneracy in the spectral function of the ``spin-flip'' operator. © 1997 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevE.55.6636
DOI:
10.1103/PhysRevE.55.6636
PACS:
05.30.-d, 03.65.Bz
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