Journal
NANO LETTERS
Volume 13, Issue 4, Pages 1451-1456Publisher
AMER CHEMICAL SOC
DOI: 10.1021/nl304352w
Keywords
NEMS; self-oscillation; low power; doubly clamped; nanowire; nanoscale contact
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We report here the observation of a new self-oscillation mechanism in nanoelectromechanical systems (NEMS). A highly resistive nanowire was positioned to form a point-contact at a chosen vibration node of a silicon carbide nanowire resonator. Spontaneous and robust mechanical oscillations arise when a sufficient DC voltage is applied between the two nanowires. An original model predicting the threshold voltage is used to estimate the piezoresistivity of the point-contact in agreement with the observations. The measured input power is in the pW-range which is the lowest reported value for such systems. The simplicity of the contacting procedure and the low power consumption open a new route for integrable and low-loss self-excited NEMS devices.
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