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Trap-recharging waves versus damped, forced charge-density oscillations in hexagonal silicon carbide

  • Solids and Liquids
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Abstract.

Resonant excitation of space-charge waves (SCW) by means of an oscillating light pattern has been investigated in hexagonal silicon carbide with 4H and 6H stacking sequence, respectively. The experimental data set can be well explained by the existence of trap recharging waves for the 4H sample and allows to determine the product of mobility and lifetime μτ = (5.7   ±   0.6) × 10-7 cm2/V, and the effective trap density Neff = (8.0 ±   1.0) × 1013 cm-3, respectively. The data set of the 6H polytype indicates a comparably smaller effective trap density, but an unambiguous assignment to the existence of trap recharging waves fails. Taking into account the general classification of material parameters which provides the existence for SCW, the particular case of damped, forced charge-density oscillations can be concluded.

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Authors and Affiliations

  1. Department of Physics, University of Osnabrück, Osnabrück, Germany

    M. Lemmer, B. Hilling, M. Wöhlecke & M. Imlau

  2. Ioffe Physico Technical Institute, Russian Academy of Sciences, St. Petersburg, Russia

    A. A. Lebedev, V. V. Bryksin & M. P. Petrov

Authors
  1. M. Lemmer
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  2. B. Hilling
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  3. M. Wöhlecke
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  4. M. Imlau
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  5. A. A. Lebedev
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  6. V. V. Bryksin
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  7. M. P. Petrov
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Correspondence to M. Lemmer.

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Lemmer, M., Hilling, B., Wöhlecke, M. et al. Trap-recharging waves versus damped, forced charge-density oscillations in hexagonal silicon carbide. Eur. Phys. J. B 60, 9–14 (2007). https://doi.org/10.1140/epjb/e2007-00318-9

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  • DOI: https://doi.org/10.1140/epjb/e2007-00318-9

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