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Millisecond Electron-Phonon Relaxation in Ultrathin Disordered Metal Films at Millikelvin Temperatures
- Publication Year :
- 2001
- Publisher :
- arXiv, 2001.
-
Abstract
- We have measured directly the thermal conductance between electrons and phonons in ultra-thin Hf and Ti films at millikelvin temperatures. The experimental data indicate that electron-phonon coupling in these films is significantly suppressed by disorder. The electron cooling time $\tau_\epsilon$ follows the $T^{-4}$-dependence with a record-long value $\tau_\epsilon=25ms$ at $T=0.04K$. The hot-electron detectors of far-infrared radiation, fabricated from such films, are expected to have a very high sensitivity. The noise equivalent power of a detector with the area $1\mum^2$ would be $(2-3)10^{-20}W/Hz^{1/2}$, which is two orders of magnitude smaller than that of the state-of-the-art bolometers.<br />Comment: 13 pages, including 3 figures
- Subjects :
- Materials science
Physics and Astronomy (miscellaneous)
Condensed matter physics
Condensed Matter - Mesoscale and Nanoscale Physics
Phonon
Relaxation (NMR)
Bolometer
FOS: Physical sciences
Electron
Disordered Systems and Neural Networks (cond-mat.dis-nn)
Condensed Matter - Disordered Systems and Neural Networks
Coupling (probability)
law.invention
Thermal conductivity
law
Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
Order of magnitude
Electron cooling
Subjects
Details
- Database :
- OpenAIRE
- Accession number :
- edsair.doi.dedup.....b7ea5a245377459856723e1e6225fcbf
- Full Text :
- https://doi.org/10.48550/arxiv.cond-mat/0104083