Phonons incident on an Al-PbBi tunnel junction were found to be detectable only if their frequency exceeds a voltage-tunable threshold. Modulating this threshold yielded a phonon spectrometer with a resolution of 10 GHz at a phonon power of 10^-6 W and a frequency range from 100 GHz up to several hundred GHz.
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W. Dietsche (1978) studied this question.
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