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Author Raghavan, S. ♦ Kenkre, V. M. ♦ Bishop, A. R. ♦ Salkola, M. I.
Source United States Department of Energy Office of Scientific and Technical Information
Content type Text
Language English
Subject Keyword PHYSICS ♦ DIMERS ♦ FLUORESCENCE ♦ BOSE-EINSTEIN GAS ♦ DEPOLARIZATION ♦ NONLINEAR PROBLEMS ♦ PHONONS ♦ QUASI PARTICLES ♦ SCHROEDINGER EQUATION ♦ SEMICLASSICAL APPROXIMATION ♦ SPIN ♦ TRANSPORT THEORY
Abstract The validity of the discrete nonlinear Schr{umlt o}dinger equation and related semi-classical transport equations is studied with the help of an exact calculation of the spin-boson system in the experimentally relevant context of the fluorescence depolarization of stick dimers. The consequences of an initial excitation corresponding to low-energy dynamics are investigated. A number of features are found including the sensitive role of the polarization angle of incident light in determining the regimes of validity. Our earlier finding that the semiclassical approximation improves in validity in a well defined {open_quote}{open_quote}massive oscillator{close_quote}{close_quote} limit involving small phonon frequency is borne out. In the opposite limit of large phonon frequency, the semiclassical approximation and the discrete nonlinear Schr{umlt o}dinger equation are found to coincide with each other but to differ significantly from the exact evolution. {copyright} {ital 1996 The American Physical Society.}
ISSN 01631829
Educational Use Research
Learning Resource Type Article
Publisher Date 1996-04-01
Publisher Place United States
Journal Physical Review, B: Condensed Matter
Volume Number 53
Issue Number 13


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