Regensburg 2013 – wissenschaftliches Programm

Bereiche | Tage | Auswahl | Suche | Aktualisierungen | Downloads | Hilfe

MM: Fachverband Metall- und Materialphysik

MM 15: Poster Session

MM 15.46: Poster

Montag, 11. März 2013, 18:00–20:00, Poster E

Simulation of the elastic properties of nanomechanical resonators — •Kristian Scholz, Daniel Mutter, Markus Ring, Ralf Schmid, Martin Vögele, and Peter Nielaba — Physics Department, University of Konstanz, Germany

The oscillation behaviour of Silicon nanomechanical resonators in the form of doubly clamped beams is investigated by Molecular Dynamics simulations using the Stillinger-Weber interaction potential. After setting up the initial structure using a diamond lattice and a (2x1) symmetric dimer surface reconstruction, the end points of the beams are fixed and a constant force is applied over all atoms in order to achieve a transverse deflection. The force is then turned off resulting in a free oscillation of the beams. Besides varying the size of the beams, the effects of temperature, external stretching fields and cavities are explored. The results show a decrease of the oscillation frequencies and an increase of the damping coefficient with rising temperature, a strong increase of the frequencies with external stress (stretching), a decrease of frequencies with length and an increase of the damping coefficient when adding cavities to the structures. It is also possible to observe the dissipation of energy from the collective oscillation of the beams into thermal energy of the degrees of freedom of the constituting atoms. Other materials (e.g. NiTi memory alloys) and membranes are explored as well. In order to explore quantum effects in the low temperature regime Path Integral Monte Carlo simulations are performed.