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Title: Critical Dependence of the Excitonic Absorption in Cuprous Oxide on Experimental Parameters

Abstract

We study the modification of the exciton absorption in cuprous oxide by the presence of free carriers excited through above band gap excitation. Without this pumping, the absorption spectrum below the band gap consists of the yellow exciton series with principal quantum numbers up to more than n = 20, depending on the temperature, changing over to an about constant, only slowly varying absorption above the gap. Careful injection of free carriers, starting from densities well below 1 μm{sup –3}, leads to a reduction of the band gap through correlation effects. The excitons in the Rydberg regime above n = 10 remain unaffected until the band gap approaches them. Then they lose oscillator strength and ultimately vanish upon crossing with the band gap.

Authors:
; ; ; ;  [1]; ;  [2]
  1. Technische Universität Dortmund, Experimentelle Physik 2 (Germany)
  2. Universität Rostock, Institut für Physik (Germany)
Publication Date:
OSTI Identifier:
22771048
Resource Type:
Journal Article
Journal Name:
Physics of the Solid State
Additional Journal Information:
Journal Volume: 60; Journal Issue: 8; Other Information: Copyright (c) 2018 Pleiades Publishing, Ltd.; Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 1063-7834
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; ABSORPTION; ABSORPTION SPECTRA; CARRIERS; COPPER OXIDES; CORRELATIONS; DENSITY; EXCITATION; EXCITONS; INJECTION; MODIFICATIONS; OSCILLATOR STRENGTHS; QUANTUM NUMBERS; REDUCTION

Citation Formats

Heckötter, J., Freitag, M., Aßmann, M., Fröhlich, D., Bayer, M., E-mail: manfred.bayer@tu-dortmund.de, Grünwald, P., and Scheel, S. Critical Dependence of the Excitonic Absorption in Cuprous Oxide on Experimental Parameters. United States: N. p., 2018. Web. doi:10.1134/S1063783418080097.
Heckötter, J., Freitag, M., Aßmann, M., Fröhlich, D., Bayer, M., E-mail: manfred.bayer@tu-dortmund.de, Grünwald, P., & Scheel, S. Critical Dependence of the Excitonic Absorption in Cuprous Oxide on Experimental Parameters. United States. doi:10.1134/S1063783418080097.
Heckötter, J., Freitag, M., Aßmann, M., Fröhlich, D., Bayer, M., E-mail: manfred.bayer@tu-dortmund.de, Grünwald, P., and Scheel, S. Wed . "Critical Dependence of the Excitonic Absorption in Cuprous Oxide on Experimental Parameters". United States. doi:10.1134/S1063783418080097.
@article{osti_22771048,
title = {Critical Dependence of the Excitonic Absorption in Cuprous Oxide on Experimental Parameters},
author = {Heckötter, J. and Freitag, M. and Aßmann, M. and Fröhlich, D. and Bayer, M., E-mail: manfred.bayer@tu-dortmund.de and Grünwald, P. and Scheel, S.},
abstractNote = {We study the modification of the exciton absorption in cuprous oxide by the presence of free carriers excited through above band gap excitation. Without this pumping, the absorption spectrum below the band gap consists of the yellow exciton series with principal quantum numbers up to more than n = 20, depending on the temperature, changing over to an about constant, only slowly varying absorption above the gap. Careful injection of free carriers, starting from densities well below 1 μm{sup –3}, leads to a reduction of the band gap through correlation effects. The excitons in the Rydberg regime above n = 10 remain unaffected until the band gap approaches them. Then they lose oscillator strength and ultimately vanish upon crossing with the band gap.},
doi = {10.1134/S1063783418080097},
journal = {Physics of the Solid State},
issn = {1063-7834},
number = 8,
volume = 60,
place = {United States},
year = {2018},
month = {8}
}