Optical Phonon Effect in GaAs

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Recently, Gunn^<1)> has predicted a possible existence of travelling-wave type interactions between the optical modes of lattice vibration and uniplar stream of charge carriers in polar crystals. According to his predictions, the polar optical waves can be amplified by virtue of the cooperative interactions with the bunched charge carriers, when the drift velocity of the latter exceeds the phase velocity of the former. For typical polar semiconductors, substantial effects are to be expected at the drift velocities ≧10^7 cm/sec. A remarkable current saturation effect has been observed in GaAs at 77°K, which may be accounted for in terms of Gunn's mechaoism.The samples used were n-GaAs (room temperature resistivities 0.2〜O.5 ohm-cm) and were of two shapes with alloyed tin contacts, -a bar shape with 1.OxO.1×O.1 cm^3 and a bridge shape with 0.36X0.075x0.09cm^3. To avoid heating of the samples, 1 μsec and 4 μsec duration voltage pulses were applied at the repetition rate 5〜20 c/sec. All experiments were carried out at liquid nitrogen temperature.
社団法人日本物理学会の論文
1964-01-05