Abstract
From millimeter-wave dimensional resonance experiments, double acceptors, Be and Zn, are found to remarkably increase carrier scattering within strain-confined electron-hole liquid in Ge. Scattering rate of Be impurity is 4.2×10 -4 cm 3 s -1 both for electrons and for holes, while that of Zn impurity is 1.0×10 -4 cm 3 s -1 for electrons and 2.3×10 -4 cm 3 s -1 for holes at 1.6 K. These values are larger than the rate for the single acceptor, In, 4.9×10 -4 cm 3 s -1 . Such a result is interpreted by the Mott criterion in accordance with recombination result obtained by photoluminescence measurements. Temperature dependence of Be-induced scattering rate yields log T behavior. One possible explanation would be a kind of Kondo effect due to the atomic motion of Be impurity.
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