Validity of the discrete nonlinear Schr{umlt o}dinger equation in the context of the fluorescence depolarization of a spin-boson system

Journal Article · Mon Apr 01 04:00:00 EST 1996 · Physical Review, B: Condensed Matter

DOI:https://doi.org/10.1103/PhysRevB.53.8457· OSTI ID:279798

Raghavan, S; Kenkre, V M ^[1]; Bishop, A R; Salkola, M I ^[2]

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1. Center for Advanced Studies, Department of Physics and Astronomy, University of New Mexico, Albuquerque, New Mexico 87131 (United States)
2. Theoretical Division and Center for Nonlinear Studies, Los Alamos National Laboratory, Los Alamos, New Mexico 87545 (United States)

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.}

• OSTI ID: 279798
• Journal Information: Physical Review, B: Condensed Matter, Journal Name: Physical Review, B: Condensed Matter Journal Issue: 13 Vol. 53; ISSN 0163-1829; ISSN PRBMDO
• Country of Publication: United States
• Language: English

Related Subjects

66 PHYSICS
BOSE-EINSTEIN GAS
DEPOLARIZATION
DIMERS
FLUORESCENCE
NONLINEAR PROBLEMS
PHONONS
QUASI PARTICLES
SCHROEDINGER EQUATION
SEMICLASSICAL APPROXIMATION
SPIN
TRANSPORT THEORY