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Proceedings Paper

Exciton absorption of p-GaSe crystals containing 2D hole gas: temperature dependencies
Author(s): Yurij I. Zhirko; Ivan P. Zharkov; Zakhar D. Kovalyuk
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Paper Abstract

Within the framework of the traditional Elliott-Toyozawa theory the investigation of absorption spectra of p-GaSe crystals pure, doped and intercalated with manganese impurity made in a wide temperature region (4.5-300K). It is shown that presence in p-GaSe of 2D hole gas localized in quantum wells (QW) that are degenerate with excitons in the momentum space leads to suppression of the oscillator strength of exciton transition for ground, as well as excited, states. It was found that growth of temperature in p-GaSe results in holes redistribution to the higher energy states. This appears as consecutive (from the ground to excited states) suppression of and re-establishment of the integral characteristics of exciton absorption bands. Data of temperature population of 2D hole gas in QW are well explain by Maxwell distribution. Slight differences that appear in temperature dependencies of exciton absorption spectra ofp-GaSe crystals pure, doped and intercalated by manganese impurity are attributed with different depth of QW and location of Fermi level in these crystals.

Paper Details

Date Published: 20 July 2004
PDF: 6 pages
Proc. SPIE 5507, XVI International Conference on Spectroscopy of Molecules and Crystals, (20 July 2004); doi: 10.1117/12.569622
Show Author Affiliations
Yurij I. Zhirko, Institute of Physics (Ukraine)
Ivan P. Zharkov, Institute of Physics (Ukraine)
Zakhar D. Kovalyuk, Institute for Material Science (Ukraine)

Published in SPIE Proceedings Vol. 5507:
XVI International Conference on Spectroscopy of Molecules and Crystals
Galyna O. Puchkovska; Tatiana A. Gavrilko; Olexandr I. Lizengevich, Editor(s)

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