Room-temperature ballistic transport in narrow graphene strips

Details Room-temperature ballistic transport in narrow graphene strips Room-temperature ballistic transport in narrow graphene strips

2006-06-27

arxiv.org/abs/cond-mat/0606693v2

PHYSICAL REVIEW B 75, 085418 (2007)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

5 pages and 5 figures

Scientific paper

10.1103/PhysRevB.75.085418

We investigate electron-phonon couplings, scattering rates, and mean free paths in zigzag-edge graphene strips with widths of the order of 10 nm. Our calculations for these graphene nanostrips show both the expected similarity with single-wall carbon nanotubes (SWNTs) and the suppression of the electron-phonon scattering due to a Dirichlet boundary condition that prohibits one major backscattering channel present in SWNTs. Low-energy acoustic phonon scattering is exponentially small at room temperature due to the large phonon wave vector required for backscattering. We find within our model that the electron-phonon mean free path is proportional to the width of the nanostrip and is approximately 70 $\mu$m for an 11-nm-wide nanostrip.

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