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Nonequilibrium dynamics of a system with quantum frustration

AutorKohler, Heiner ; Hackl, Andreas; Kehrein, Stefan
Fecha de publicación2013
EditorAmerican Physical Society
CitaciónPhysical Review B 88: 205122 (2013)
ResumenUsing flow equations and equilibrium and nonequilibrium dynamics of a two-level system (TLS) is investigated, which couples Ohmically via noncommuting components to two independent oscillator baths. In equilibrium, the two-level energy splitting is protected when the TLS is coupled symmetrically to both baths. A critical asymmetry angle separates the localized from the delocalized phase. Real-time decoherence of a nonequilibrium initial state is studied as well. The short-time dynamics exhibits initial slips on the scale of the cutoff frequency of the bath modes. Moreover, whereas for a single bath decay of coherence depends crucially on the chosen initial state, for a symmetric coupling to two baths this dependence vanishes. © 2013 American Physical Society.
Versión del editorhttp://dx.doi.org/10.1103/PhysRevB.88.205122
URIhttp://hdl.handle.net/10261/95146
DOI10.1103/PhysRevB.88.205122
Identificadoresdoi: 10.1103/PhysRevB.88.205122
issn: 1098-0121
e-issn: 1550-235X
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