Numéro
Le Journal de Physique IV
Volume 03, Numéro C5, Octobre 1993
Third International Conference on Optics of Excitons in Confined
Page(s) C5-433 - C5-436
DOI http://dx.doi.org/10.1051/jp4:1993593
Third International Conference on Optics of Excitons in Confined

Le Journal de Physique IV 03 (1993) C5-433-C5-436

DOI: 10.1051/jp4:1993593

Nonlinear optical spectra of confined and localized excitons in mesoscopic domain and quasi-2D stacking fault interface in BiI3 crystals

I. AKAI, H. KONDO, M. ICHIDA, T. KARASAWA and T. KOMATSU

Department of Physics, Faculty of Science, Osaka City University, 3-3-138 Sugimoto Sumiyoshi-ku Osaka 558, Japan


Abstract
Saturation spectra of the excitons confined and localized at several kinds of stacking disorders in layered crystal BiI3 are studied. The quasi-two dimensional exciton localized at the stacking fault interface does not saturate its absorption strength below the density of 105W/cm2 due to the large binding energy and the lateral center-of-mass motion along the interface. On the exciton system associated with some polytypic structures contained in a very small region, an obvious absorption saturation is observed. The behaviour of absorption saturation is well described by a saturation effect on a simplified two-level system having a homogeneous line broadening. An absorption saturation is also observed on the confined excitons in mesoscopic domains induced by the external deformation of the crystal. The pumping-laser photon-energy dependence of the saturation density characterizes this exciton system to be inhomogeneous.



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