Non-Equilibrium Phonon Processes and Degradation in Gigahertz Nanoscale Mechanical Resonators
Abstract
Nonequilibrium phonon processes and related degradation effects were treated for a Euler-Bernoulli flexural beam undergoing scaling from the micro to the nano spatial regime. For the scaling lengths under consideration, the lowest resonator mode is in the frequency range of 1-10 GHz. In a Euler-Bernoulli-Boltzmann framework, an analysis of the internal phonon dynamics and flow in the flexural beam is conducted, and dissipative losses are evaluated. In limiting cases, two major intrinsic dissipative mechanisms are operative, one due to the diffusive spatial redistribution of phonons resulting in heat transfer and thermoelastic loss, and the other due to the thermalization of the local phonon population distorted by strain resulting in a manifestation of the Akhiezer effect. In the frequency domain of interest,these two loss mechanisms loss their distinctive character with decreased scaling and transition to a unified dissipative process.
Document Details
- Document Type
- Technical Report
- Publication Date
- Sep 09, 2008
- Accession Number
- ADA501162
Entities
People
- Andrey A. Kiselev
- Gerald J. Iafrate
Organizations
- North Carolina State University