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Hot electrons in low-dimensional phonon systems

S. -X. Qu·A. N. Cleland·M. R. Geller
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Abstract

A simple bulk model of electron-phonon coupling in metals has been surprisingly successful in explaining experiments on metal films that actually involve surface- or other low-dimensional phonons. However, by an exact application of this standard model to a semi-infinite substrate with a free surface, making use of the actual vibrational modes of the substrate, we show that such agreement is fortuitous, and that the model actually predicts a low-temperature crossover from the familiar T^5 temperature dependence to a stronger T^6 log T scaling. Comparison with existing experiments suggests a widespread breakdown of the standard model of electron-phonon thermalization in metals.

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S. -X. Qu, A. N. Cleland, M. R. Geller. 2005-03-15. Hot electrons in low-dimensional phonon systems. https://doi.org/10.1103/physrevb.72.224301

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