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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, AO
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 Omega which can be very close (or even equal) to the spin Zeeman frequency Delta. Mapping the problem onto a two-state system (TSS) coupled to a harmonic oscillator (HO) with frequency omega(0), 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.
Country: Inglaterra
Editor: Iop Publishing Ltd
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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