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Excitonic Diamagnetic Shifts and Magnetic Field Dependent Linewidths in AlxGa1-xAs Alloys

  • G. Coli (a1), K. K. Bajaj (a1), J. L. Reno (a2) and E. D. Jones (a2)

Abstract

We report measurements of both the diamagnetic shifts and the linewidths of excitonic transitions in AlxGa1-xAs alloys as a function of Al concentration and magnetic field at 1.4 K using photoluminescence spectroscopy. The magnetic field was varied from 0 to 13 tesla and Al composition in our samples ranged from 0 to 30%. The samples were grown on GaAs substrates oriented along [001] direction using molecular beam epitaxy at 590°C. We find that for a given value of alloy composition, both the diamagnetic shift and excitonic linewidth increase as a function of magnetic field. To explain our experimental data we propose that the excitons are localized in a very specific manner. To simulate this localization, we assume that the exciton reduced mass is effectively increased and is obtained by using the alloy dependent heavy-hole mass along (001) direction treated isotropically. The calculated values of the variations of the diamagnetic shift and excitonic linewidth as a function of magnetic field obtained using this model agree very well with those reported here.

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1. Goede, O., John, L., and Hennig, D. H., Phys. Status Solidi B 89, K183 (1978).
2. Singh, J. and Bajaj, K. K., Appl. Phys. Lett. 44, 1075 (1984).
3. Schubert, E. F., Gobel, E. O., Horikoshi, Y., Ploog, K., and Queisser, H. J., Phys. Rev B30, 813 (1984).
4. Singh, J. and Bajaj, K. K., Appl. Phys. Lett. 48, 1077 (1986).
5. Zimmerman, J., J. Crystal Growth 101, 346 (1990).
6. Lee, S. M. and Bajaj, K. K., J. Appl. Phys. 73, 1788 (1993).
7. Lyo, S. K., Phys Rev. B48, 2152 (1993).
8. Raikh, M. E. and Éfros, A. L., Fiz. Tverd. Tela (Leningrad) 26, 106 (1984) [Sov. Phys. Solid State 26, 61 (1984)].
9. Jones, E. D., Schneider, R. P., Lee, S. M., and Bajaj, K. K., Phys. Rev B46, 7225 (1992).
10. See for example Zhuralev, K. S., Toropov, A. I., Shamirzaev, T. S. and Bakarov, A. K., Appl. Phys. Lett. 76, 1131 (2000) and references cited therein.
11. See for example by Pavesi, L., “Photoluminescence Spectra of AlGaAs,” Properties of Aluminum Gallium Arsenide edited by Adachi, S. (INSPEC, the Institution of Electrical Engineers, London 1993) pp. 245268.
12. Mena, R. A., Sanders, G. D, Bajaj, K. K., and Dudley, S. C., J. Appl. Phys. 70, 1866 (1991).
13. Fedders, F. A., Phys Rev. B25, 3846 (1982).

Excitonic Diamagnetic Shifts and Magnetic Field Dependent Linewidths in AlxGa1-xAs Alloys

  • G. Coli (a1), K. K. Bajaj (a1), J. L. Reno (a2) and E. D. Jones (a2)

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