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Type: Artigo de periódico
Title: Dissipative Dynamics Of A Two-level System Resonantly Coupled To A Harmonic Mode
Author: Brito F.
Caldeira A.O.
Abstract: We propose an approximation scheme to describe the dynamics of the spin-boson model when the spectral density of the environment shows a peak at a characteristic frequency Ω which can be very close (or even equal) to the spin Zeeman frequency Δ. Mapping the problem onto a two-state system (TSS) coupled to a harmonic oscillator (HO) with frequency ω0, we show that the representation of displaced HO states provides an appropriate basis to truncate the Hilbert space of the TSS-HO system and therefore a better picture of the system dynamics. We derive an effective Hamiltonian for the TSS-HO system, and show it furnishes a very good approximation for the system dynamics even when its two subsystems are moderately coupled. Finally, assuming the regime of weak HO-bath coupling and low temperatures, we are able to analytically evaluate the dissipative TSS dynamics. © IOP Publishing Ltd and Deutsche Physikalische Gesellschaft.
Rights: aberto
Identifier DOI: 10.1088/1367-2630/10/11/115014
Date Issue: 2008
Appears in Collections:Unicamp - Artigos e Outros Documentos

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