Hidden Caldeira-Leggett dissipation in a Bose-Fermi Kondo model.
Phys Rev Lett
; 95(8): 086406, 2005 Aug 19.
Article
em En
| MEDLINE
| ID: mdl-16196880
ABSTRACT
We show that the Bose-Fermi Kondo model (BFKM), which may find applicability both to certain dissipative mesoscopic qubit devices and to heavy-fermion systems described by the Kondo lattice model, can be mapped exactly onto the Caldeira-Leggett model. This mapping requires an ohmic bosonic bath and an Ising-type coupling between the latter and the impurity spin. This allows us to conclude unambiguously that there is an emergent Kosterlitz-Thouless quantum phase transition in the BFKM with an ohmic bosonic bath. By applying a bosonic numerical renormalization group approach, we thoroughly probe physical quantities close to the quantum phase transition.
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Base de dados:
MEDLINE
Idioma:
En
Ano de publicação:
2005
Tipo de documento:
Article