Quenched Phonon Drag in Silicon Microcontacts

The thermoelectric power of silicon decreases precipitously when the dimensions of a microcontact are reduced below a critical value. The critical dimension $L$ decreases with rising temperature $T$ and is a measure for an interaction length of electron-phonon coupling. The dimensional reduction inhibits the phonon-drag contribution to the thermoelectric power; the predicted scaling with ${L}^{\ensuremath{-}1}{T}^{\ensuremath{-}4}$ is verified for the first time.

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