- Conference date: 22-27 July 2001
- Location: Madison, Wisconsin (USA)
Recently proposed submillimeter hot-electron direct detectors rely on a weak thermal coupling between electrons and phonons. According to the theory, this should occur in impure films. So far, the experimental situation has been somewhat confusing. A number of works have shown a cubic temperature dependence of the electron-phonon relaxation rate below 1 K. In contrast to the traditional explanation, we show that it was not a clean limit behavior but rather an intermediate temperature asymptotics. In this case, an electron scattering from transversal phonons mediated by vibrating impurities/boundaries dominates. In our recent experiments we reached the dirty limit predicted by the theory in Hf and Ti films. A measured electron-phonon relaxation time followed the dependence and was a record-long (25 ms) at 40 mK.
- Terahertz detectors
- Electron scattering
- Relaxation times
- Time measurement
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