Berlin 2012 – wissenschaftliches Programm

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MM: Fachverband Metall- und Materialphysik

MM 17: Poster Session

MM 17.68: Poster

Montag, 26. März 2012, 17:00–19:00, Poster B

Simulation of the elastic properties of nanomechanical resonators — •Kristian Scholz, Daniel Mutter, Bartholomäus Strobel, 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 (2×1) 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 and external stretching fields are explored. The results show a decrease of the oscillation frequencies with rising temperature and a strong increase of the damping coefficient, a strong increase of the frequencies with external stress (stretching) and a decrease of frequencies with length. Other materials (e.g. NiTi memory alloys) are explored as well.