Large Dip and Hump Type Quantum Oscillations in Magnetoacoustic Attenuation in Dilute Bi1-xSbx Alloys for q ∧H ∼90°. II. Theory

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Abstract
Peculiar dependences of dip and hump type quantum oscillations with greatly enhanced amplitudes in magnetoacoustic attenuation in dilute Bi 1- x Sb x alloys are theoretically investigated. The dependences studied are those on the direction of the sound wave vector q , the antimony concentration x , the sound wave frequency f , and the angle between q and the magnetic field vector H . It is assumed that the electron-hole recombination time τ r of the alloys decreases greatly from that of pure bismuth. On the basis of Kuramoto's expression for the sound attenuation including the recombination process, almost all aspects of the above-mentioned dependences are explained in detail.