The interaction of thermal phonons with conduction electrons in InSb. Application to heat-pulse spectroscopy
نویسندگان
چکیده
2014 High frequency ballistic phonons were radiated by the heat pulse method (To 4.2 K) into degenerate n-type indium antimonide crystals. We first review the relevant aspects of the electronphonon interaction : cut-off for phonon wavevectors larger than twice the Fermi radius (q > 2 kF), selective coupling of the longitudinal modes and screening effects. Then, we report original extensive measurements of phonon absorption as a function of the electron concentration in the semiconductor. The Fermi sphere acts as a high-pass filter, which enables phonon spectroscopy with no adjustable parameters. As a result, the frequency distribution of a heat pulse could be determined in a detailed fashion. LE JOURNAL DE PHYSIQUE TOME 37, MAI 1976, Classification Physics Abstracts 7.660
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