Two-bath spin-boson model: Phase diagram and critical properties
Publikation: Beitrag in Fachzeitschrift › Forschungsartikel › Beigetragen › Begutachtung
Beitragende
Abstract
The spin-boson model, describing a two-level system coupled to a bath of harmonic oscillators, is a generic model for quantum dissipation, with manifold applications. It has also been studied as a simple example for an impurity quantum phase transition. Here, we present a detailed study of a U(1)-symmetric two-bath spin-boson model, where two different components of an SU(2) spin 12 are coupled to separate dissipative baths. Nontrivial physics arises from the competition of the two dissipation channels, resulting in a variety of phases and quantum phase transitions. We employ a combination of analytical and numerical techniques to determine the properties of both the stable phases and the quantum critical points. In particular, we find a critical intermediate-coupling phase which is bounded by a continuous quantum phase transition which violates the quantum-to-classical correspondence.
Details
Originalsprache | Englisch |
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Aufsatznummer | 245130 |
Fachzeitschrift | Physical Review B - Condensed Matter and Materials Physics |
Jahrgang | 90 |
Ausgabenummer | 24 |
Publikationsstatus | Veröffentlicht - 18 Dez. 2014 |
Peer-Review-Status | Ja |