Influence of Phonon dimensionality on Electron Energy Relaxation

Details Influence of Phonon dimensionality on Electron Energy Relaxation Influence of Phonon dimensionality on Electron Energy Relaxation

2007-04-03

arxiv.org/abs/0704.0336v2

Phys. Rev. Lett. 99, 145503 (2007).

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

Phys. Rev. Lett. in press

Scientific paper

10.1103/PhysRevLett.99.145503

We studied experimentally the role of phonon dimensionality on electron-phonon (e-p) interaction in thin copper wires evaporated either on suspended silicon nitride membranes or on bulk substrates, at sub-Kelvin temperatures. The power emitted from electrons to phonons was measured using sensitive normal metal-insulator-superconductor (NIS) tunnel junction thermometers. Membrane thicknesses ranging from 30 nm to 750 nm were used to clearly see the onset of the effects of two-dimensional (2D) phonon system. We observed for the first time that a 2D phonon spectrum clearly changes the temperature dependence and strength of the e-p scattering rate, with the interaction becoming stronger at the lowest temperatures below $\sim$ 0.5 K for the 30 nm membranes.

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