Exciton localization in semimagnetic semiconductors probed by magnetic polarons

Physical Review B - Condensed Matter and Materials Physics

Volumn 60, Issue 24, 1999, Pages 16499-16505

  Yakovlev, D R ^b   Ossau, W ^b   Landwehr, G ^b  

^a IOFFE INSTITUTE   (Russian Federation)

^b UNIVERSITY OF WÜRZBURG   (Germany)

Author keywords

[No Author keywords available]

Indexed keywords

EID: 0001247114     PISSN: 10980121     EISSN: 1550235X     Source Type: Journal    
DOI: 10.1103/PhysRevB.60.16499     Document Type: Article

References (17)

1. S. Permogorov and A. Reznitsky, J. Lumin. 52, 201 (1992).
2. Optics of Semiconductor Nanostructures, edited by F. Henneberger, S. Schmitt-Rink, and E. O. Göbel (Akademie-Verlag, Berlin, 1993).
3. J. K. Furdyna, J. Appl. Phys. 64, R29 (1988).
4. T. Dietl and J. Spalek, Phys. Rev. Lett. 48, 355 (1982).
5. J. Warnock, R. N. Kershaw, D. Ridgely, K. Dwight, A. Wold, and R. R. Galazka, J. Lumin. 34, 25 (1985);
6. J. WarnockR. N. KershawD. RidgelyK. DwightA. WoldR. R. GalazkaSolid State Commun. 54, 215 (1985).
7. V. P. Kochereshko, I. A. Merkulov, K. V. Kavokin, D. R. Yakovlev, G. Mackh, W. Ossau, and G. Landwehr, Proceedings of the International Conference on Semiconductor Heteroepitaxy, Montpellier, France 1995, edited by B. Gil and R. L. Aulombard (World Scientific, Singapore, 1995), p. 218.
8. D. R. Yakovlev, V. P. Kochereshko, I. A. Merkulov, G. Mackh, W. Ossau, A. Waag, and G. Landwehr, Proceedings of the 23rd International Conference Physics of Semiconductors, Berlin, Germany 1996, edited by M. Scheffler and R. Zimmermann (World Scientific, Singapore, 1996), p. 397.
9. I. A. Merkulov, D. R. Yakovlev, K. V. Kavokin, G. Mackh, W. Ossau, A. Waag, and G. Landwehr, Pis’ma Zh. Eksp. Teor. Fiz. 62, 313 (1995) [JETP Lett. 62, 335 (1995).]
10. D. R. Yakovlev and K. V. Kavokin, Comments Condens. Matter Phys. 18, 51 (1996).
11. G. Mackh, W. Ossau, D. R. Yakovlev, A. Waag, G. Landwehr, R. Hellmann, and E. O. Göbel, Phys. Rev. B 49, 10 248 (1994).
12. G. Mackh, M. Hilpert, D. R. Yakovlev, W. Ossau, H. Heinke, T. Litz, F. Fischer, A. Waag, G. Landwehr, R. Hellmann, and E. O. Göbel, Phys. Rev. B 50, 14 069 (1994).
13. J. A. Gaj, R. Planel, and G. Fishman, Solid State Commun. 29, 435 (1979).
14. W. J. Ossau and B. Kuhn-Heinrich, Physica B 184, 442 (1993).
15. The polarization can be influenced by the magnetic-polaron effect also. Strictly speaking, the equilibrium distribution of spins of localized excitons is determined by alignment of magnetic-polaron magnetic moments in the external field [see Yu. G. Kusrayev and A. V. Koudinov, Phys. Status Solidi B 190, 315 (1995)]. However, as it was shown in Ref. 8, formation of the magnetic polaron drastically slows down the directional relaxation of its magnetic moment, so that the equilibrium distribution is not reached during the exciton lifetime. For this reason, the polarization of luminescence is determined by the initial distribution of magnetic moments of spin fluctuations. This conclusion may not be valid for samples with lower x, where polaron formation time is long (see discussion in Sec. III), and in the case when strong localization and/or high magnetic susceptibility leads to saturation of magnetization inside the polaron. One should, therefore, be careful when analyzing data on luminescence polarization. A comparison with estimations of the localization radius obtained from magnetic-polaron energy (see previous subsection) is a valuable a posteriori test of validity of the approach.
16. S. Oseroff and P. H. Keesom, in Semiconductors and Semimetals, edited by J. K. Furdyna and J. Kossut (Academic, London, 1988), Vol. 25, p. 73.
17. R. Fiederling, D. R. Yakovlev, W. Ossau, G. Landwehr, I. A. Merkulov, K. V. Kavokin, T. Wojtowicz, M. Kutrovski, K. Grasza, G. Karczewski, and J. Kossut, Phys. Rev. B 58, 4785 (1998).