ISSN:
0392-6737
Keywords:
Polarons and electron-phonon interactions
;
Electron states in low-dimensional structures (including quantum wells, superlattices, layer structures, and intercalation compounds)
;
Optical properties of thin films, surfaces, and layer structures (superlattices, heterojunctions, and multilayers)
;
Conference proceedings
Source:
Springer Online Journal Archives 1860-2000
Topics:
Physics
Notes:
Summary The self-trapping of a Frenkel exciton in quantum wells of various dimensionalities and thicknesses is theoretically studied. Using a (2J x +1)×(2J y +1)×(2J z +1) lattice-site model, we variationally calculate the relaxed exciton state for various strength of the coupling constantg of the short-range exciton-lattice interaction. In slab-type QWs (∞×∞×(2J z +1)), asg increases the stable state abruptly changes from the free stateF to the self-trapped stateS as in the exact three-dimension. In wire-type QWs (∞×(2J y +1)×(2J z +1)), wheng is small the stable state is a weakly localized state (large-radius polaron), which corresponds toF ing=0 limit, but the Stokes shift of the emission from thisF state is non-zero. Wheng becomes large this large-radius polaron state,F, characteristic of a one-dimensional system coexists with a small-radius polaron state,S, characteristic of a three-dimensional system.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF02457270
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