Spectroscopy of mechanical dissipation in micro-mechanical membranes
  We measure the frequency dependence of the mechanical quality factor (Q) of SiN membrane oscillators and observe a resonant variation of Q by more than two orders of magnitude. The frequency of the fundamental mechanical mode is tuned reversibly by up to 40% through local heating with a laser. Several distinct resonances in Q are observed that can be explained by coupling to membrane frame modes. Away from the resonances, the background Q is independent of frequency and temperature in the measured range. 
Andreas J\"ockel, Matthew T. Rakher, Maria Korppi, Stephan Camerer,   David Hunger, Matthias Mader, Philipp Treutlein
quant-ph cond-mat.mes-hall