Feedback cooling of cantilever motion using a quantum point contact transducer
| Autor: | Martino Poggio, H. S. Solanki, A. Mehlin, David D. Awschalom, M. Montinaro, P. Peddibhotla, Shawn Mack |
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| Jazyk: | angličtina |
| Rok vydání: | 2012 |
| Předmět: |
Capacitive coupling
Physics Cantilever Physics and Astronomy (miscellaneous) Condensed Matter - Mesoscale and Nanoscale Physics Acoustics Quantum point contact Measure (physics) FOS: Physical sciences 01 natural sciences 7. Clean energy Noise (electronics) Displacement (vector) 010305 fluids & plasmas Conductor Transducer Mesoscale and Nanoscale Physics (cond-mat.mes-hall) 0103 physical sciences 010306 general physics |
| Zdroj: | Applied Physics Letters |
| Popis: | We use a quantum point contact (QPC) as a displacement transducer to measure and control the low-temperature thermal motion of a nearby micromechanical cantilever. The QPC is included in an active feedback loop designed to cool the cantilever's fundamental mechanical mode, achieving a squashing of the QPC noise at high gain. The minimum achieved effective mode temperature of 0.2 K and the displacement resolution of 10^(-11) m/Hz^(1/2) are limited by the performance of the QPC as a one-dimensional conductor and by the cantilever-QPC capacitive coupling. 5 pages, 4 figures |
| Databáze: | OpenAIRE |
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