Hot electrons in low-dimensional phonon systems

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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• Electron heating in metallic resistors at sub-Kelvin temperature
• Electron energy relaxation by phonons in the Kondo condensate
• Electronic cooling of a submicron-sized metallic beam
• Electronic coolers based on superconducting tunnel junctions: fundamentals and applications
• Existence of an Independent Phonon Bath in a Quantum Device
• Low-temperature electron-phonon heat transfer in metal films
• Equilibrium states of a test particle coupled to finite size heat baths
• Crossover between electron-phonon and boundary resistance limited thermal relaxation in copper films
• Evidence of the disorder-independent electron-phonon scattering time in thin NbN films
• Cooling, conductance and thermometric performance of non-ideal normal metal-superconductor tunnel junction pairs
• Modification of electron-phonon coupling by micromachining and suspension
• Heat capacity of suspended phonon cavities
• Electron-phonon heat exchange in layered nano-systems
• Revisiting the low temperature electron-phonon relaxation of noble metals
• Cold-electron bolometer, as a 1 cm wavelength photon counter