Dissipation due to two-level systems in nano-mechanical devicesC. Seoanez1, F. Guinea1 and A. H. Castro Neto2, 3
1 Instituto de Ciencia de Materiales de Madrid, CSIC - Cantoblanco, E28049 Madrid, Spain
2 Department of Physics, Harvard University - Cambridge, MA 02138, USA
3 Department of Physics, Boston University - 590 Commonwealth Avenue, Boston, MA 02215, USA
received 13 February 2007; accepted in final form 2 May 2007; published June 2007
published online 24 May 2007
We analyze the dissipation of the vibrations of nano-mechanical devices. We show that the coupling between flexural modes and two-level systems leads to sub-ohmic dissipation. The inverse quality factor of the flexural modes of low frequencies depends on temperature as , providing a quantitative description of the experimental data.
03.65.Yz - Decoherence; open systems; quantum statistical methods.
62.40.+i - Anelasticity, internal friction, stress relaxation, and mechanical resonances.
85.85.+j - Micro- and nano-electromechanical systems (MEMS/NEMS) and devices.
© Europhysics Letters Association 2007