Strong coupling between single-electron tunneling and nano-mechanical motion

Details Strong coupling between single-electron tunneling and nano-mechanical motion Strong coupling between single-electron tunneling and nano-mechanical motion

2010-01-25

arxiv.org/abs/1001.4372v1

Science 325, 1103 (2009)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

Main text 12 pages, 4 Figures, Supplement 13 pages, 6 Figures

Scientific paper

10.1126/science.1176076

Nanoscale resonators that oscillate at high frequencies are useful in many measurement applications. We studied a high-quality mechanical resonator made from a suspended carbon nanotube driven into motion by applying a periodic radio frequency potential using a nearby antenna. Single-electron charge fluctuations created periodic modulations of the mechanical resonance frequency. A quality factor exceeding 10^5 allows the detection of a shift in resonance frequency caused by the addition of a single-electron charge on the nanotube. Additional evidence for the strong coupling of mechanical motion and electron tunneling is provided by an energy transfer to the electrons causing mechanical damping and unusual nonlinear behavior. We also discovered that a direct current through the nanotube spontaneously drives the mechanical resonator, exerting a force that is coherent with the high-frequency resonant mechanical motion.

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