20 July 2004 Exciton absorption of p-GaSe crystals containing 2D hole gas: temperature dependencies
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Proceedings Volume 5507, XVI International Conference on Spectroscopy of Molecules and Crystals; (2004) https://doi.org/10.1117/12.569622
Event: XVI International Conference on Spectroscopy of Molecules and Crystals, 2003, Sevastopol, Ukraine
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.
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Yurij I. Zhirko, Yurij I. Zhirko, Ivan P. Zharkov, Ivan P. Zharkov, Zakhar D. Kovalyuk, Zakhar D. Kovalyuk, } "Exciton absorption of p-GaSe crystals containing 2D hole gas: temperature dependencies", Proc. SPIE 5507, XVI International Conference on Spectroscopy of Molecules and Crystals, (20 July 2004); doi: 10.1117/12.569622; https://doi.org/10.1117/12.569622
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