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Diffraction and near-zero transmission of flexural phonons at graphene grain boundaries

Edit E. Helgee (Institutionen för teknisk fysik, Kondenserade materiens teori) ; Andreas Isacsson (Institutionen för teknisk fysik, Kondenserade materiens teori)
Physical Review B. Condensed Matter and Materials Physics (1098-0121). Vol. 91 (2015), 20,
[Artikel, refereegranskad vetenskaplig]

Graphene grain boundaries are known to affect phonon transport and thermal conductivity, suggesting that they may be used to engineer the phononic properties of graphene. Here, the effect of two buckled grain boundaries on long-wavelength flexural acoustic phonons has been investigated as a function of angle of incidence using molecular dynamics. The flexural acoustic mode has been chosen due to its importance to thermal transport. It is found that the transmission through the boundaries is strongly suppressed for incidence angles close to 35 degrees. Also, the grain boundaries are found to act as diffraction gratings for the phonons.



Denna post skapades 2015-06-29. Senast ändrad 2015-06-29.
CPL Pubid: 219033

 

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Institutioner (Chalmers)

Institutionen för teknisk fysik, Kondenserade materiens teori (1900-2015)

Ämnesområden

Fysik

Chalmers infrastruktur

 


Projekt

Denna publikation är ett resultat av följande projekt:


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