Charge Sensitivity Enhancement via Mechanical Oscillation in Suspended Carbon Nanotube Devices
Journal article, 2015

Single electron transistors (SETs) fabricated from single-walled carbon nanotubes (SWNTs) can be operated as highly sensitive charge detectors reaching sensitivity levels comparable to metallic radio frequency SETs (rf-SETs). Here, we demonstrate how the charge sensitivity of the device can be improved by using the mechanical oscillations of a single-walled carbon nanotube quantum dot. To optimize the charge sensitivity dQ, we drive the mechanical resonator far into the nonlinear regime and bias it to an operating point where the mechanical third order nonlinearity is canceled out. This way we enhance dQ, from 6 mu e/(Hz)(1/2) for the static case to 0.97 mu e/(Hz)(1/2) at a probe frequency of similar to 1.3 kHz.

charge sensing


nanomechanical resonator

single-walled carbon nanotube


P. Hakkinen

Aalto University

Andreas Isacsson

Chalmers, Applied Physics, Condensed Matter Theory

A. Savin

Aalto University

J. Sulkko

Aalto University

P Hakonen

Aalto University

Nano Letters

1530-6984 (ISSN) 1530-6992 (eISSN)

Vol. 15 3 1667-1672

Graphene-Based Revolutions in ICT And Beyond (Graphene Flagship)

European Commission (FP7), 2013-10-01 -- 2016-03-31.

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Other Engineering and Technologies

Nano Technology



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