Noise thermometry and electron thermometry of a sample-on-cantilever system below 1 Kelvin
arXiv:0708.2878 · doi:10.1063/1.2821828
Abstract
We have used two types of thermometry to study thermal fluctuations in a microcantilever-based system below 1 K. We measured the temperature of a cantilever's macroscopic degree-of-freedom (via the Brownian motion of its lowest flexural mode) and its microscopic degrees-of-freedom (via the electron temperature of a metal sample mounted on the cantilever). We also measured both temperatures' response to a localized heat source. We find it possible to maintain thermal equilibrium between these two temperatures and a refrigerator down to at least 300 mK. These results are promising for ongoing experiments to probe quantum effects using micromechanical devices.
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- An off-board quantum point contact as a sensitive detector of cantilever motion
- Energy repartition for a harmonic chain with local reservoirs
- High sensitivity cantilevers for measuring persistent currents in normal metal rings
- Charge and spin polarized currents in mesoscopic rings with Rashba spin-orbit interactions coupled to an electron reservoir