The Transition Between Quantum Coherence and Incoherence

Details The Transition Between Quantum Coherence and Incoherence The Transition Between Quantum Coherence and Incoherence

1997-02-14

arxiv.org/abs/cond-mat/9702141v2

Physics

Condensed Matter

Strongly Correlated Electrons

some typos corrected and a reference added

Scientific paper

10.1103/PhysRevE.55.6636

We show that a transformed Caldeira-Leggett Hamltonian 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 non-degeneracy in the spectral function of the ``spin-flip'' operator.

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