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Unformatted text preview: the main valley to the valence band maximum? (b) Electrons recombining from the satellite valley dow n to the maximum in the valence band w ould give rise to phonon emission ( to account for the change in momentum or w avenumber k). Calculate 1 the w avelength of the phonon if k = 5 x 10 cm . 8-1 (c) Assuming the electron collision time remains the same, calculate the ratio of mobility for electrons in the main valley to that for electrons excited to the satellite valley. (d) Explain the physical origin of the current-voltage (I-V) characteristics show n in the sketch for a typical Transferred Electron Device (TED) or Gunn oscillator....
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