Room temperature on-wafer ballistic graphene field-effect-transistor with oblique double-gate

Abstract

We have fabricated and measured ballistic graphene transistors with two oblique gates that can be independently biased. The gate lengths are about 38 nm and are separated by a distance of 30 nm, the tilting angle being of 45o with respect to source and drain electrodes distanced at 190 nm. Electric measurements reveal specific properties of ballistic carrier transport, i.e. nonlinear drain voltage-drain current dependence, showing a saturation region, and negative differential resistance at certain bias voltages, which cannot be explained without physical mechanisms related to ballistic transport. Tens of ballistic transistors, with very large transconductances, were fabricated on a chip cut from a 4 inch graphene wafer. Such double-gate transistor configurations can be used also as extremely efficient, state-of-the-art photodetectors.

References in corpus (5)

• Chiral tunneling and the Klein paradox in graphene
• Micrometer-scale ballistic transport in encapsulated graphene at room temperature
• Exceptional ballistic transport in epitaxial graphene nanoribbons
• Negative differential resistance in graphene-based ballistic field effect transistor with oblique top gate
• Enhanced architectures for room-temperature reversible logic gates in graphene

Cited by in corpus (1)

• Wafer-scale fabrication and room-temperature experiments on graphene-based gates for quantum computation