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Observation of the interaction between Landau levels of different two-dimensional subbands in GaAs in a normal magnetic field

  • Condensed Matter
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Abstract

Tunnel current measurements between strongly disordered two-dimensional electron systems in a perpendicular magnetic field are presented. Two-dimensional electron accumulation layers are formed by an extremely narrow layer of Si donors (Si delta doping) in GaAs on either side of an AlGaAs tunnel barrier. Strong interaction between Landau levels of the two-dimensional subbands in each accumulation layer is observed as an anticrossing of the related peak positions in the tunnel current vs. voltage curves as a function of magnetic field. The splitting of the interacting Landau levels is about 10 meV, which cannot be explained by nonparabolicity of the conduction band in GaAs. A possible reason for the observed interaction connected with the collective excitations in the 2DES is discussed.

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Authors and Affiliations

  1. Institute of Microelectronic Technology and Ultrahigh-Purity Materials, Russian Academy of Sciences, Chernogolovka, Moscow region, 142432, Russia

    D. Yu. Ivanov & Yu. V. Dubrovskii

  2. Institute of Radio Engineering and Electronics, Russian Academy of Sciences, ul. Mokhovaya 18, Moscow, 103907, Russia

    E. Takhtamirov & V. A. Volkov

  3. The School of Physics and Astronomy, University of Nottingham, Nottingham, NG7 2RD, UK

    L. Eaves, P. C. Main & M. Henini

  4. Grenoble High Magnetic Field Laboratory, MPI-CNRS, BP166 38042, Grenoble Cedex 9, France

    D. K. Maude & J. -C. Portal

  5. High Field Magnet Laboratory, Research Institute for Materials, University of Nijmegen, 6525 ED, Nijmegen, The Netherlands

    J. C. Maan

  6. Department of Electrical Engineering, University of Sheffield, Sheffield, S3 3JD, UK

    G. Hill

  7. Institut Universitaire de France, Institut National des Sciences Appliquees, F31077, Toulouse Cedex 4, France

    J. -C. Portal

Authors
  1. D. Yu. Ivanov
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  2. E. Takhtamirov
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  3. Yu. V. Dubrovskii
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  4. V. A. Volkov
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  5. L. Eaves
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  6. P. C. Main
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  7. M. Henini
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  8. D. K. Maude
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  9. J. -C. Portal
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  10. J. C. Maan
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  11. G. Hill
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Additional information

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Translated from Pis’ma v Zhurnal Éksperimental’no\(\overset{\lower0.5em\hbox{$\smash{\scriptscriptstyle\smile}$}}{l} \) i Teoretichesko\(\overset{\lower0.5em\hbox{$\smash{\scriptscriptstyle\smile}$}}{l} \) Fiziki, Vol. 72, No. 9, 2000, pp. 684–688.

Original Russian Text Copyright © 2000 by Ivanov, Takhtamirov, Dubrovskii, Volkov, Eaves, Main, Henini, Maude, Portal, Maan, Hill.

This article was submitted by the authors in English.

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Ivanov, D.Y., Takhtamirov, E., Dubrovskii, Y.V. et al. Observation of the interaction between Landau levels of different two-dimensional subbands in GaAs in a normal magnetic field. Jetp Lett. 72, 476–479 (2000). https://doi.org/10.1134/1.1339904

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  • DOI: https://doi.org/10.1134/1.1339904

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