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The Influence of Coulomb Interactions on a 2DEG in High Magnetic Fields

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Book cover High Magnetic Fields in Semiconductor Physics II

Part of the book series: Springer Series in Solid-State Sciences ((SSSOL,volume 87))

Abstract

Optical and thermal activation studies have been made of the magneto-excitations in a 2DEG in high magnetic fields. At integer Landau level occupancies it is found that both the ‘bare’ spin and cyclotron energies have considerable exchange contributions due to Coulomb interactions when measured by activation. For fractional occupancies the many body ground state at v = 1/5 has been shown to give a new hierarchy of states, and its excitation energies compared with the family arising from v = 1/3. Cyclotron resonance studies at 200mK where the carriers are condensed into the fractional ground state show no evidence of Coulomb interactions.

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Author information

Authors and Affiliations

  1. Clarendon Laboratory, Parks Rd., Oxford, OX13PU, UK

    R. J. Nicholas, D. J. Barnes, R. G. Clark, S. R. Haynes, J. R. Mallett, A. M. Suckling & A. Usher

  2. Philips Research Laboratory, Redhill, Surrey, RH1 5HA, UK

    J. J. Harris & C. T. Foxon

  3. Massachusetts Institute of Technology, Cambridge, MA, 02139, USA

    R. Willett

Authors
  1. R. J. Nicholas
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  2. D. J. Barnes
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  3. R. G. Clark
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  4. S. R. Haynes
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  5. J. R. Mallett
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  7. A. Usher
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  8. J. J. Harris
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  9. C. T. Foxon
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Editors and Affiliations

  1. Physikalisches Institut, Universität Würzburg, Am Hubland, D-8700, Wüzburg, Fed. Rep. of Germany

    Gottfried Landwehr

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© 1989 Springer-Verlag Berlin, Heidelberg

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Nicholas, R.J. et al. (1989). The Influence of Coulomb Interactions on a 2DEG in High Magnetic Fields. In: Landwehr, G. (eds) High Magnetic Fields in Semiconductor Physics II. Springer Series in Solid-State Sciences, vol 87. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-83810-1_18

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  • DOI: https://doi.org/10.1007/978-3-642-83810-1_18

  • Publisher Name: Springer, Berlin, Heidelberg

  • Print ISBN: 978-3-642-83812-5

  • Online ISBN: 978-3-642-83810-1

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