Cyclotron effective mass in wide parabolic quantum wells

K. Karraï, M. Stopa, X. Ying, H. D. Drew, S. Das Sarma, M. Shayegan

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Cyclotron-resonance measurements are reported for wide (100 300 nm) modulation-doped AlxGa1-xAs graded parabolic quantum wells for electron areal densities NS=109/cm2 2.5×1011/cm2. A clear dependence of the cyclotron frequency on NS is observed in the extreme quantum limit which is understood in terms of alloy effects. Self-consistent calculations that include the x dependence of the local effective mass and exchange-correlation effects in a local-density approximation are in quantitative agreement with the measurements for high densities. At low densities a pinning of the cyclotron frequency is observed that is not predicted by the model.

Original languageEnglish (US)
Pages (from-to)9732-9735
Number of pages4
JournalPhysical Review B
Issue number15
StatePublished - Jan 1 1990

All Science Journal Classification (ASJC) codes

  • Condensed Matter Physics

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    Karraï, K., Stopa, M., Ying, X., Drew, H. D., Das Sarma, S., & Shayegan, M. (1990). Cyclotron effective mass in wide parabolic quantum wells. Physical Review B, 42(15), 9732-9735.