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RESEARCH PRODUCT
Influence of Phonon dimensionality on Electron Energy Relaxation
J. T. KarvonenIlari Maasiltasubject
Materials sciencePhononGeneral Physics and Astronomychemistry.chemical_elementFOS: Physical sciences02 engineering and technologyElectron01 natural scienceschemistry.chemical_compoundCondensed Matter::Materials ScienceTunnel junctionCondensed Matter::Superconductivity0103 physical sciencesMesoscale and Nanoscale Physics (cond-mat.mes-hall)010306 general physicsCondensed Matter - Mesoscale and Nanoscale PhysicsCondensed matter physicsRelaxation (NMR)021001 nanoscience & nanotechnologyCondensed Matter::Mesoscopic Systems and Quantum Hall EffectCopperMembraneSilicon nitridechemistryScattering rateCondensed Matter::Strongly Correlated Electrons0210 nano-technologydescription
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.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 2007-04-03 |