Exciton spin relaxation in In 0.53Ga 0.47As/AlAs 0.56Sb 0.44 quantum wells

K. Sasayama, S. Nakanishi, R. Yamaguchi, Y. Oyanagi, T. Ushimi, S. Gozu, T. Mozume, A. Tackeuchi

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Abstract

The spin relaxation process of In 0.53Ga 0.47As/ AlAs 0.56Sb 0.44 quantum wells is investigated by spin-dependent pump and probe reflectance measurements with a high time resolution of 200 fs. The observed spin relaxation time of 17.5 ps at 20 K indicates high potential for applications to high-speed optical devices. A positive temperature dependence of the spin relaxation time due to the unique band structure is observed at 30-100 K. The spin relaxation is found to be mainly governed by the Bir-Aronov-Pikus process [Sov. Phys. JETP 42, 705 (1976)] below 100 K and by the D'yakonov-Perel' process above 100 K.

Original languageEnglish
Article number092401
JournalApplied Physics Letters
Volume100
Issue number9
DOIs
Publication statusPublished - 2012 Feb 27

ASJC Scopus subject areas

  • Physics and Astronomy (miscellaneous)

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    Sasayama, K., Nakanishi, S., Yamaguchi, R., Oyanagi, Y., Ushimi, T., Gozu, S., Mozume, T., & Tackeuchi, A. (2012). Exciton spin relaxation in In 0.53Ga 0.47As/AlAs 0.56Sb 0.44 quantum wells. Applied Physics Letters, 100(9), [092401]. https://doi.org/10.1063/1.3690833