Electron-Hole Recombination Effect on the Quantum Oscillations of Sound Velocity for q ∧ H〜90°in Dilute Bi_<1-x>Sb_x Alloys

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The quantum oscillations of sound velocity in dilute Bi.-.Sb. alloys with x0, 1.0 x 10 ' and 3.6 x 10 ' have been investigated under the condition that themagnetic field vector H has been applied perpendicularly or nearly perpendic-ularly to the sound wave vector q. The oscillation-amplitudes in the alloys havebeen found to be greatly enhanced compared with those in pure bismuth. These areanalized on the basis of a theory which takes account of the contributions fromthe limiting point carriers, from the carriers on the nonextrema[ orbits and theelectron-hole recombination process due to the carriers on the extremal orbits.It is shown that the remarkable enhancement in amplitudes is mainly caused by acoupling of two affairs, i.e., one order shorter electron-hole recombination timein the alloys than that in pure bismuth and the contribution from the limitingpoint carriers as in the case of the attenuation coefficient.
社団法人日本物理学会の論文
1983-04-15