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Friday, August 15 • 11:00 - 13:00
Carbon: Nanotubes & Graphene V

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11:00-11:30

Invited: Walter A. de Heer
Ballistic Transport in Graphene Nanoribbons
Co-authors: John Hankinson, Claire Berger, Walter A. de Heer

Graphene nanoribbons are essential components in future graphene nanoelectronics. However, in typical nanoribbons produced from lithographically patterned exfoliated graphene, the charge carriers travel only about 10 nanometers between scattering events, resulting in minimum sheet resistances of about 1 kW  In contrast 40 nm wide graphene nanoribbons that are epitaxially grown on silicon carbide are single channel room temperature ballistic conductors on greater than 10 µm length scale, similarly to metallic carbon nanotubes. This is equivalent to sheet resistances below 1W surpassing theoretical predictions for perfect graphene by at least an order of magnitude. In neutral graphene ribbons, we show that transport is dominated by two modes. One is ballistic and temperature independent; the other is thermally activated. Transport is protected from back-scattering, possibly reflecting ground state properties of neutral graphene. At room temperature the resistance of both modes abruptly increases non-linearly with increasing length, one at a length of 16 µm and the other at 160 nm. Besides their importance for fundamental science, since epitaxial graphene nanoribbons are readily produced by the thousands, their room temperature ballistic transport properties can be used in advanced nanoelectronics as well. 

11:30-11:45

Oral: Stephan Engels
On the Limits of Electron Transport in High-Mobility Bilayer Graphene
Co-authors: Bernat Terrés, Alexander Epping, Tymofiy Khodkov, Kenji Watanabe, Takashi Taniguchi, Bernd Beschoten, Christoph Stampfer

11:45-12:00
Oral: Farhad Karimi
Optical Response of Zigzag Graphene Nanoribbons
Co-author: Irena Knezevic

12:00-12:15
Oral: Nancy Sandler
Conductance & LDOS of Graphene Ribbons with Centro-Symmetric out of Plane Deformations
Co-authors: Ramon Carrillo, Martin Schneider, Daiara Faria, Silvia Viola Kusminskiy, Andrea Latge, Francisco Mireles

12:15-12:30
Oral: Mandhour Lassaad
Minimal Conductivity in Ballistic Bilayer Graphene with a Twist
Co-authors: Sihem Jaziri, Ameni Daboussi 

12:30-12:45
Oral: Akira Satou
Effects of Carrier-Carrier Scattering on Graphene Terahertz/Photonic Devices
Co-authors: Victor Ryzhii, Vladimir Mitin, Fedir Vasko, Taiichi Otsuji

12:45-13:00
Oral: Chris Corbet
Ultrathin Gate Dielectrics Created from Oxidized Titanium for Graphene Field Effect Transistors

Session Chairs
LF

Leonard Franklin Register

The University of Texas at Austin

Speakers
WA

Walter A. de Heer

Regents' Professor, School of Physics, Georgia Tech


Friday August 15, 2014 11:00 - 13:00
Room 18AB

Attendees (18)