Excitonic properties of ZnS quantum wells in ZnMgS

B. Urbaszek, C. M. Townsley, X. Tang, C. Morhain, A. Balocchi, K. A. Prior, R. J. Nicholas, B. C. Cavenett

Research output: Contribution to journalArticle

Abstract

The excitonic properties of cubic ZnS quantum wells in ZnMgS are studied by reflectivity and magneto-optics. A remarkable improvement in the quality of the samples grown by MBE on GaP substrates has allowed the observation of heavy and light hole exciton transitions with values for the FWHM as narrow as 5 meV. The 2s state of the heavy hole exciton is identified and exciton binding energies as high as 55 meV are deduced, indicating that for quantum wells narrower than 3.5 nm the exciton-LO phonon scattering can be suppressed. Zeeman splittings of the order of 10 meV for both the light and heavy hole exciton transitions appear in magneto-reflectivity spectra in magnetic fields up to 54 T. Large light hole exciton g-values of the order of four for all quantum wells are obtained due to the light hole being the uppermost valence band in these tensile strained quantum wells. A strong reduction in the diamagnetic shifts for narrow wells is observed due to increasing quantum confinement.

Original languageEnglish
Pages (from-to)549-552
Number of pages4
JournalPhysica Status Solidi B - Basic Research
Volume229
Issue number1
DOIs
Publication statusPublished - 2002

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excitons
quantum wells
reflectance
magneto-optics
binding energy
valence
shift
scattering
magnetic fields

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Urbaszek, B., Townsley, C. M., Tang, X., Morhain, C., Balocchi, A., Prior, K. A., ... Cavenett, B. C. (2002). Excitonic properties of ZnS quantum wells in ZnMgS. Physica Status Solidi B - Basic Research, 229(1), 549-552. https://doi.org/10.1002/1521-3951(200201)229:1<549::AID-PSSB549>3.0.CO;2-0
Urbaszek, B. ; Townsley, C. M. ; Tang, X. ; Morhain, C. ; Balocchi, A. ; Prior, K. A. ; Nicholas, R. J. ; Cavenett, B. C. / Excitonic properties of ZnS quantum wells in ZnMgS. In: Physica Status Solidi B - Basic Research. 2002 ; Vol. 229, No. 1. pp. 549-552.
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Urbaszek, B, Townsley, CM, Tang, X, Morhain, C, Balocchi, A, Prior, KA, Nicholas, RJ & Cavenett, BC 2002, 'Excitonic properties of ZnS quantum wells in ZnMgS', Physica Status Solidi B - Basic Research, vol. 229, no. 1, pp. 549-552. https://doi.org/10.1002/1521-3951(200201)229:1<549::AID-PSSB549>3.0.CO;2-0

Excitonic properties of ZnS quantum wells in ZnMgS. / Urbaszek, B.; Townsley, C. M.; Tang, X.; Morhain, C.; Balocchi, A.; Prior, K. A.; Nicholas, R. J.; Cavenett, B. C.

In: Physica Status Solidi B - Basic Research, Vol. 229, No. 1, 2002, p. 549-552.

Research output: Contribution to journalArticle

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T1 - Excitonic properties of ZnS quantum wells in ZnMgS

AU - Urbaszek, B.

AU - Townsley, C. M.

AU - Tang, X.

AU - Morhain, C.

AU - Balocchi, A.

AU - Prior, K. A.

AU - Nicholas, R. J.

AU - Cavenett, B. C.

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AB - The excitonic properties of cubic ZnS quantum wells in ZnMgS are studied by reflectivity and magneto-optics. A remarkable improvement in the quality of the samples grown by MBE on GaP substrates has allowed the observation of heavy and light hole exciton transitions with values for the FWHM as narrow as 5 meV. The 2s state of the heavy hole exciton is identified and exciton binding energies as high as 55 meV are deduced, indicating that for quantum wells narrower than 3.5 nm the exciton-LO phonon scattering can be suppressed. Zeeman splittings of the order of 10 meV for both the light and heavy hole exciton transitions appear in magneto-reflectivity spectra in magnetic fields up to 54 T. Large light hole exciton g-values of the order of four for all quantum wells are obtained due to the light hole being the uppermost valence band in these tensile strained quantum wells. A strong reduction in the diamagnetic shifts for narrow wells is observed due to increasing quantum confinement.

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