Tunable dynamics of a flake on graphene: Libration frequency

In this paper we investigated the interaction between a graphene nanoflake anchored to the 2D graphene monolayer. This interaction is attractive but weak and is capable of setting a well defined registry in equilibrium. Rotational and linear displacements from equilibrium registry generate restoring...

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Bibliographic Details
Published in:Physical review. B 2017-03, Vol.95 (12), p.125413, Article 125413
Main Authors: Aktürk, O. Üzengi, Aktürk, E., Gürel, H. H., Ciraci, S.
Format: Article
Language:English
Subjects:
Density functional theory
Equilibrium
First principles
Flakes
Friction reduction
Graphene
Harmonic motion
Libration
Magnetic properties
Monolayers
Predictions
Self-assembly
Simple harmonic motion
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Summary:In this paper we investigated the interaction between a graphene nanoflake anchored to the 2D graphene monolayer. This interaction is attractive but weak and is capable of setting a well defined registry in equilibrium. Rotational and linear displacements from equilibrium registry generate restoring forces, which can be controlled by external agents. Similar flakes can be self-assembled and can also execute simple harmonic motion as if a physical pendulum. Oscillation of a nanoflake about their equilibrium registries resulting in a characteristic libration frequency is predicted. This frequency depends on the size and geometry of the flake. Moreover, the libration frequency, as well as the electronic and magnetic properties of the flake+monolayer systems, can be tuned by a foreign molecule anchored to the flake, by electric charging and applied parallel and perpendicular electric and magnetic fields. When the sliding of the flake is combined with rotation, the friction force can be reduced dramatically. It is surprising that weak interaction can offer such features at nanoscale, which may offer potential applications. Our predictions are obtained by first-principles calculations based on density functional theory.
ISSN:2469-9950
2469-9969
DOI:10.1103/PhysRevB.95.125413