A nanomechanical resonator shuttling single electrons at radio   frequencies
  We observe transport of electrons through a metallic island on the tip of a nanomechanical pendulum. The resulting tunneling current shows distinct features corresponding to the discrete mechanical eigenfrequencies of the pendulum. We report on measurements covering the temperature range from 300 K down to 4.2 K. We explain the I-V curve, which differs from previous theoretical predictions, with model calculations based on a Master equation approach. 
A. Erbe, C. Weiss, W. Zwerger and R.H. Blick (Center for NanoScience,   University of Munich)