Detection of mechanical resonance of a single-electron transistor by direct current

Pashkin, Yu. A.; Li, T. F.; Pekola, J. P.; Astafiev, O.; Knyazev, D. A.; Hoehne, F.; Im, H.; Nakamura, Y.; Tsai, J. S.
June 2010
Applied Physics Letters;6/28/2010, Vol. 96 Issue 26, p263513
Academic Journal
We have suspended an Al based single-electron transistor (SET) whose island can resonate freely between the source and drain leads forming the clamps. In addition to the regular side gate, a bottom gate with a larger capacitance to the SET island is placed underneath to increase the SET coupling to mechanical motion. The device can be considered as a doubly clamped Al beam that can transduce mechanical vibrations into variations in the SET current. Our simulations based on the orthodox model, with the SET parameters estimated from the experiment, reproduce the observed transport characteristics in detail.


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