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Phonon resonances in optical spectra of donors in quantum wells

Identifieur interne : 001191 ( Istex/Corpus ); précédent : 001190; suivant : 001192

Phonon resonances in optical spectra of donors in quantum wells

Auteurs : S. Bednarek ; B. Szafran ; J. Adamowski ; I. Essaoudi ; B. Stébé

Source :

RBID : ISTEX:AE43F0CCC8EE385FBC5D797D243C98E4CF5AFA37

Abstract

An influence of electron–phonon coupling and electron confinement on optical spectra is studied for donors in semiconductor quantum wells. A binding and 1s–2p transition energies have been calculated by the optimized canonical transformation method for GaAs/AlGaAs, CdTe/CdZnTe, and CdF2/CaF2 quantum wells. We have found that — in the quantum wells made from the ionic semiconductors — the 1s–2p transition energy exceeds the LO-phonon energy and the phonon resonances can appear in the optical spectra of donors. We have estimated the parameters of quantum wells, for which the phonon resonances can be detected in the absence of external magnetic field.

Url:
DOI: 10.1016/S0921-4526(99)00561-X

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ISTEX:AE43F0CCC8EE385FBC5D797D243C98E4CF5AFA37

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<note type="content">Fig. 1: Lattice relaxation energy W for the donor ground state as a function of QW thickness L for CdTe/Cd0.7Zn0.3Te. Solid curves display the results obtained with different displacement amplitudes and their linear combinations (see text), dashed curve shows the square-root mean value of z coordinate of electron.</note>
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<note type="content">Fig. 3: Calculated 1s binding energy (EB) and 1s–2p transition energy (ET) as a function of QW thickness L for CdTe/Cd0.7Zn0.3Te (solid curves, right energy scale) and CdF2/CaF2 (dashed curves, left energy scale) QWs. Short horizontal lines show the positions of phonon resonances.</note>
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<affiliation>Faculty of Physics and Nuclear Techniques, University of Mining and Metallurgy (AGH), al. Mickiewicza 30, Kraków, Poland</affiliation>
<affiliation>Corresponding author. Tel.: +4812-6172974; fax: +4812-6340010</affiliation>
<affiliation>E-mail: adamowski@novell.ftj.agh.edu.pl</affiliation>
<role>
<roleTerm type="text">author</roleTerm>
</role>
</name>
<name type="personal">
<namePart type="given">I.</namePart>
<namePart type="family">Essaoudi</namePart>
<affiliation>Department of Physics, University Moulay Ismail, Meknes, Morocco</affiliation>
<role>
<roleTerm type="text">author</roleTerm>
</role>
</name>
<name type="personal">
<namePart type="given">B.</namePart>
<namePart type="family">Stébé</namePart>
<affiliation>Institut de Physique et d'Electronique, Université de Metz, France</affiliation>
<role>
<roleTerm type="text">author</roleTerm>
</role>
</name>
<typeOfResource>text</typeOfResource>
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<originInfo>
<publisher>ELSEVIER</publisher>
<dateIssued encoding="w3cdtf">1999</dateIssued>
<copyrightDate encoding="w3cdtf">1999</copyrightDate>
</originInfo>
<language>
<languageTerm type="code" authority="iso639-2b">eng</languageTerm>
<languageTerm type="code" authority="rfc3066">en</languageTerm>
</language>
<physicalDescription>
<internetMediaType>text/html</internetMediaType>
</physicalDescription>
<abstract lang="en">An influence of electron–phonon coupling and electron confinement on optical spectra is studied for donors in semiconductor quantum wells. A binding and 1s–2p transition energies have been calculated by the optimized canonical transformation method for GaAs/AlGaAs, CdTe/CdZnTe, and CdF2/CaF2 quantum wells. We have found that — in the quantum wells made from the ionic semiconductors — the 1s–2p transition energy exceeds the LO-phonon energy and the phonon resonances can appear in the optical spectra of donors. We have estimated the parameters of quantum wells, for which the phonon resonances can be detected in the absence of external magnetic field.</abstract>
<note type="content">Fig. 1: Lattice relaxation energy W for the donor ground state as a function of QW thickness L for CdTe/Cd0.7Zn0.3Te. Solid curves display the results obtained with different displacement amplitudes and their linear combinations (see text), dashed curve shows the square-root mean value of z coordinate of electron.</note>
<note type="content">Fig. 2: Lattice relaxation energy W for 1s and 2p donor states (solid curves) and ground state of confined polaron (dashed curve) for CdTe/Cd0.7Zn0.3Te QWs as a function of thickness L.</note>
<note type="content">Fig. 3: Calculated 1s binding energy (EB) and 1s–2p transition energy (ET) as a function of QW thickness L for CdTe/Cd0.7Zn0.3Te (solid curves, right energy scale) and CdF2/CaF2 (dashed curves, left energy scale) QWs. Short horizontal lines show the positions of phonon resonances.</note>
<subject>
<genre>Keywords</genre>
<topic>Donor center</topic>
<topic>Electron–phonon coupling</topic>
<topic>Quantum well</topic>
</subject>
<relatedItem type="host">
<titleInfo>
<title>Physica B: Physics of Condensed Matter</title>
</titleInfo>
<titleInfo type="abbreviated">
<title>PHYSB</title>
</titleInfo>
<genre type="journal">journal</genre>
<originInfo>
<dateIssued encoding="w3cdtf">19991215</dateIssued>
</originInfo>
<identifier type="ISSN">0921-4526</identifier>
<identifier type="PII">S0921-4526(00)X0083-X</identifier>
<part>
<date>19991215</date>
<detail type="volume">
<number>273–274</number>
<caption>vol.</caption>
</detail>
<detail type="supplement">
<number>C</number>
<caption>Suppl.</caption>
</detail>
<extent unit="issue pages">
<start>1</start>
<end>1064</end>
</extent>
<extent unit="pages">
<start>947</start>
<end>950</end>
</extent>
</part>
</relatedItem>
<identifier type="istex">AE43F0CCC8EE385FBC5D797D243C98E4CF5AFA37</identifier>
<identifier type="DOI">10.1016/S0921-4526(99)00561-X</identifier>
<identifier type="PII">S0921-4526(99)00561-X</identifier>
<accessCondition type="use and reproduction" contentType="copyright">©1999 Elsevier Science B.V.</accessCondition>
<recordInfo>
<recordContentSource>ELSEVIER</recordContentSource>
<recordOrigin>Elsevier Science B.V., ©1999</recordOrigin>
</recordInfo>
</mods>
</metadata>
<serie></serie>
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