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Particle number scaling for diffusion-induced dissipation in graphene and carbon nanotube nanomechanical resonators

Christin Rhen (Institutionen för fysik, Kondenserade materiens teori (Chalmers)) ; Andreas Isacsson (Institutionen för fysik, Kondenserade materiens teori (Chalmers))
Physical Review B. Condensed Matter and Materials Physics (1098-0121). Vol. 93 (2016), 12,
[Artikel, refereegranskad vetenskaplig]

When a contaminant diffuses on the surface of a nanomechanical resonator, the motions of the two become correlated. Despite being a high-order effect in the resonator-particle coupling, such correlations affect the system dynamics by inducing dissipation of the resonator energy. Here, we consider this diffusion-induced dissipation in the cases of multiple particles adsorbed on carbon nanotube and graphene resonators. By solving the stochastic equations of motion, we simulate the ringdown of the resonator, in order to determine the resonator energy decay rate. We find two different scalings with the number of adsorbed particles K and particle mass m. In the regime where the adsorbates are inertially trapped at an antinode of vibration, the dissipation rate Gamma scales with the total adsorbed mass Gamma alpha Km. In contrast, in the regime where particles diffuse freely over the resonator, the dissipation rate scales as the product of the total adsorbed mass and the individual particle mass: Gamma alpha Km(2).



Denna post skapades 2016-04-06. Senast ändrad 2016-04-06.
CPL Pubid: 234217

 

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Institutioner (Chalmers)

Institutionen för fysik, Kondenserade materiens teori (Chalmers)

Ämnesområden

Den kondenserade materiens fysik

Chalmers infrastruktur

 


Projekt

Denna publikation är ett resultat av följande projekt:


Graphene-Based Revolutions in ICT And Beyond (GRAPHENE) (EC/FP7/604391)