Excitonic properties of ZnS quantum wells

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

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The excitonic properties of cubic ZnS quantum wells in ZnMgS are studied by reflectivity and magnetooptics. A remarkable improvement in the quality of the samples grown by molecular-beam epitaxy on GaP substrates has allowed the observation of heavy- and light-hole exciton transitions with values for the full width at half maximum as narrow as 5 meV. The 2s state of the heavy-hole exciton is identified and exciton binding energies of 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 magnetoreflectivity spectra in magnetic fields up to 54 T. Large light-hole exciton g values of the order of 4 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
Article number155321
Pages (from-to)1553211-1553216
Number of pages6
JournalPhysical Review B: Condensed Matter and Materials Physics
Issue number15
Publication statusPublished - 15 Oct 2001

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    Urbaszek, B., Townsley, C. M., Tang, X., Morhain, C., Balocchi, A., Prior, K. A., Nicholas, R. J., & Cavenett, B. C. (2001). Excitonic properties of ZnS quantum wells. Physical Review B: Condensed Matter and Materials Physics, 64(15), 1553211-1553216. [155321].