Anisotropy of the Electron and Hole Drift Mobility in KNbO3 and BaTiO3

نویسندگان

  • Pietro Bernasconi
  • Ivan Biaggio
  • Marko Zgonik
  • Peter Günter
چکیده

We determine the anisotropy of the mobility of photoexcited charge carriers in single crystals of KNbO3 and BaTiO3 by means of a purely optical method. In orthorhombic KNbO3 the mobility anisotropy is measured for both electrons and holes giving ma mc 1.05 6 0.06, mb mc 2.9 6 0.3 for holes and ma mc 1.15 6 0.09, mb mc 1.9 6 0.2 for electrons. In BaTiO3 we find for holes ma mc 19.6 6 0.6. Our experiment also demonstrates that the acoustic phonon contribution to the dielectric permittivity is substantially different for spatially modulated electric fields as compared to the homogeneous case. [S0031-9007(96)02051-0]

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تاریخ انتشار 2001