Feedback cooling of cantilever motion using a quantum point contact transducer

Montinaro, M. and Mehlin, A. and Solanki, H. S. and Peddibhotla, P. and Mack, S. and Awschalom, D. D. and Poggio, M.. (2012) Feedback cooling of cantilever motion using a quantum point contact transducer. Applied Physics Letters, 101. p. 133104.

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Official URL: http://edoc.unibas.ch/dok/A6070509

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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⎯⎯⎯⎯⎯√ are limited by the performance of the QPC as a one-dimensional conductor and by the cantilever-QPC capacitive coupling.
Faculties and Departments:05 Faculty of Science > Departement Physik > Physik > Nanotechnologie Argovia (Poggio)
UniBasel Contributors:Poggio, Martino and Montinaro, Michele and Mehlin, Andrea and Solanki, Hari Shankar and Peddibhotla, Phani Kumar
Item Type:Article, refereed
Article Subtype:Research Article
Publisher:AIP Publishing
Note:Publication type according to Uni Basel Research Database: Journal article
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Last Modified:27 Jul 2018 14:48
Deposited On:01 Mar 2013 11:12

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