Abstract
Structures due to the electron-phonon interaction have been observed at helium temperatures on I-V characteristics, around a voltage of +or-24 mV. In a polar material like InSb the electron-phonon interaction is mainly of electrostatic origin, and non-local effects are important. The theoretical framework of Caroli, Combescot, Nozieres and Saint James (1972) is used to calculate the tunnel current due to this interaction. The different phonon lineshapes are predicted, and an expression for the ratio of the phonon conductance to the elastic conductance is given.

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