Daniel Gunlycke

Graphene Valley Filter Using a Line Defect

With its two degenerate valleys at the Fermi level, the band structure of graphene provides the opportunity to develop unconventional electronic applications. Herein, we show that electron and hole quasiparticles in graphene can be filtered according to which valley they occupy without the need to introduce confinement. The proposed valley filter is based on scattering off a recently observed line defect in graphene. Quantum transport calculations show that the line defect is semitransparent and that quasiparticles arriving at the line defect with a high angle of incidence are transmitted with a valley polarization near 100%.

Room-temperature ballistic transport in narrow graphene strips

We investigate electron-phonon couplings, scattering rates, and mean free paths in zigzag-edge graphene strips with widths of the order of

Semiconducting graphene nanostrips with edge disorder

10\phantom{\rule{0.3em}{0ex}}\mathrm{nm}

Altering low-bias transport in zigzag-edge graphene nanostrips with edge chemistry

. 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

Conductance Anisotropy in Epitaxial Graphene Sheets Generated by Substrate Interactions

70\phantom{\rule{0.3em}{0ex}}\ensuremath{\mu}\mathrm{m}

Chemically isolated graphene nanoribbons reversibly formed in fluorographene using polymer nanowire masks

for an

Field effect on spin-polarized transport in graphene nanoribbons

11\text{\ensuremath{-}}\mathrm{nm}

Edges Bring New Dimension to Graphene Nanoribbons

-wide nanostrip.

Complex electrical permittivity of the monolayer molybdenum disulfide (MoS 2 ) in near UV and visible

Results of calculations are presented which show that edge disorder can easily transform semiconducting graphene nanostrips into Anderson insulators. However, it is also shown that this problem could be overcome by adjusting the nanostrip aspect ratio to decrease the effects of the edge disorder without making the nanostrip so wide as to close the semiconducting band gap or so short as to allow tunneling through the band gap.

Confinement, Transport Gap, and Valley Polarization in Graphene from Two Parallel Decorated Line Defects

Zigzag-edge graphene nanostrips could be terminated with a variety of atoms or functional groups. Presented local-density-functional calculations show that these different species have a significant impact on the electronic structure of these strips near the Fermi level. The terminations covered include hydrogen and oxygen atoms as well as hydroxyl and imine groups. Zigzag-edge nanostrips terminated with hydrogen atoms or hydroxyl groups exhibit spin polarization in equilibrium, while the nanostrips terminated with oxygen or imine groups are unpolarized, leading to much different low-bias transport properties.