Berlin 2015 – scientific programme
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MM: Fachverband Metall- und Materialphysik
MM 28: Poster Session II
MM 28.11: Poster
Tuesday, March 17, 2015, 18:30–20:30, Poster E
Simulation of the elastic properties of nanomechanical beam and membrane resonators — •Kristian Scholz, Ananta Kälberer, Tobias Kemmer, Thomas Möller, Daniel Mutter, Markus Ring, Ralf Schmid, Martin Vögele, and Peter Nielaba — University of Konstanz, Germany
The oscillation behavior of nanomechanical resonators in the form of
doubly clamped beams and clamped membranes is investigated by Molecular Dynamics
simulations. After setting up the initial structure, the end points of the beams
or the outer border of the membranes, respectively, 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 structures. Besides varying the size of the structures, the effects of
temperature, external stretching fields, cavities and crystal faults 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 size 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 structures into thermal energy of the degrees of freedom of the
constituting atoms.
Different materials (e.g. Si, Si3N4 and NiTi memory alloys) are explored as well.
In order to explore quantum effects in the low temperature regime Path
Integral Monte Carlo simulations are performed.