Spin-boson coupling in continuous-time quantum Monte Carlo

A vector bosonic field coupled to the electronic spin is treated by means of the continuous-time quantum Monte Carlo method. In the Bose-Kondo model with a sub-Ohmic density of states [rho] omega ( omega ) [proportional, variant]oc omega super(s) with s = 0.2, two contributions to the spin susceptib...

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Veröffentlicht in:Physical review. B, Condensed matter and materials physics Condensed matter and materials physics, 2013-03, Vol.87 (12), Article 125102
1. Verfasser: Otsuki, Junya
Format: Artikel
Sprache:eng
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Zusammenfassung:A vector bosonic field coupled to the electronic spin is treated by means of the continuous-time quantum Monte Carlo method. In the Bose-Kondo model with a sub-Ohmic density of states [rho] omega ( omega ) [proportional, variant]oc omega super(s) with s = 0.2, two contributions to the spin susceptibility, the Curie term T super(-1) and the term T super(-)s due to bosonic fluctuations, are observed separately. This result indicates the existence of a residual moment and a hidden critical behavior. By including hybridization with itinerant electrons, a quantum critical point is identified between this local-moment state and the Kondo singlet state. It is demonstrated that the energy scale of the bosonic fluctuations is not affected by the quantum phase transition.
ISSN:1098-0121
1550-235X
DOI:10.1103/PhysRevB.87.125102