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Excitonic properties of zinc-blende ZnSe/MgS superlattices studied by reflection spectroscopy

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Title: Excitonic properties of zinc-blende ZnSe/MgS superlattices studied by reflection spectroscopy
Authors: Kumano, H.1 Browse this author →KAKEN DB
Nashiki, Hiroyuki Browse this author
Suemune, Ikuo Browse this author →KAKEN DB
Arita, Munetaka Browse this author
Obinata, Toshio Browse this author
Suzuki, Hideki Browse this author
Uesugii, Katsuhiro Browse this author
Nakahara, Jun'ichiro Browse this author
Authors(alt): 熊野, 英和1
Issue Date: Feb-1997
Publisher: The American Physical Society
Volume: 55
Issue: 7
Start Page: 4449
End Page: 4455
Publisher DOI: 10.1103/PhysRevB.55.4449
Abstract: Excitonic properties of newly developed zinc-blende ZnSe/MgS superlattices (SL’s) were measured by reflection spectroscopy. The modification of the excitonic peaks by the multiple reflection in the SL films was treated theoretically and a fitting method to estimate the exciton absorption peak positions and exciton linewidths was developed. Although zinc-blende MgS did not exist before, excellent optical properties were observed in the ZnSe/MgS SL’s. Excitonic structures were clearly observed from 13 K up to the measured room temperature. In spite of strong ionicity of MgS barrier layers in the ZnSe/MgS SL’s, the reduction of exciton–LO-phonon coupling was clearly observed in narrower wells. This indicates that the quantum confinement effect on excitons is large due to the large band offsets and it overcomes the enhancement of exciton–LO-phonon scattering due to high ionicity in barrier layers.
Rights: Copyright © 1997 American Physical Society
Type: article
Appears in Collections:電子科学研究所 (Research Institute for Electronic Science) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

Submitter: 熊野 英和

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