Modulation of exciton states through resonant excitation by continuous wave lasers in a GaAs/AlAs multiple quantum well

Kojima, O., Kita, T., Steer, M. J. and Hogg, R. A. (2021) Modulation of exciton states through resonant excitation by continuous wave lasers in a GaAs/AlAs multiple quantum well. Journal of Physics D: Applied Physics, 54(33), 335106. (doi: 10.1088/1361-6463/ac03ea)

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Abstract

Interactions between excitons with different energies are significant in device application, particularly in the emission of intense terahertz (THz) waves caused by difference frequency mixing. In this paper, the interactions of excitons generated by two resonant continuous-wave laser beams are assessed via the change in reflectivity. While calculations suggest that the reflectivity change depends on the exciton number, experimental results measured for various excitation powers, probe powers, and excitation energies (heavy-hole (HH) and light-hole (LH) excitons) show different profiles. Furthermore, the signals probed at a HH exciton differ from those at a LH exciton. These results indicate the importance of careful control of excitation levels for THz wave generation.

Item Type:Articles
Additional Information:We would like to acknowledge financial support provided by JSPS KAKENHI Grant Numbers 26289088, 16KK0129 and 19K04532, the JSPS International Research Fellow (Graduate School of Engineering, Kobe University), Masuya-Kinen Basic Research Foundation, Sasakura Enviro-Science Foundation, Kawanishi Memorial ShinMaywa Education Foundation and Support Center for Advanced Telecommunications Technology Research Foundation.
Status:Published
Refereed:Yes
Glasgow Author(s) Enlighten ID:Steer, Dr Matthew and Kojima, Professor Osamu and Hogg, Professor Richard
Authors: Kojima, O., Kita, T., Steer, M. J., and Hogg, R. A.
College/School:College of Science and Engineering > School of Engineering
College of Science and Engineering > School of Engineering > Electronics and Nanoscale Engineering
Journal Name:Journal of Physics D: Applied Physics
Publisher:IOP Publishing
ISSN:0022-3727
ISSN (Online):1361-6463
Published Online:09 June 2021
Copyright Holders:Copyright © 2021 IOP Publishing Ltd
First Published:First published in Journal of Physics D: Applied Physics 54(33): 335106
Publisher Policy:Reproduced in accordance with the publisher copyright policy

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