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Nonlinear Ballistic Transport in an Atomically Thin Material.

Mathias J Boland1, Abhishek Sundararajan1, M Javad Farrokhi1

  • 1Department of Physics & Astronomy, University of Kentucky , Lexington, Kentucky 40506, United States.

ACS Nano
|December 3, 2015
PubMed
Summary
This summary is machine-generated.

Researchers observed intrinsic nonlinear ballistic transport in ultrashort single-layer graphene devices. This finding, distinct from bilayer graphene, opens doors for extremely scaled, high-speed electronics.

Keywords:
2D materialselectromigrationgraphenetransportultrashort channel length

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Area of Science:

  • Condensed Matter Physics
  • Nanotechnology
  • Materials Science

Background:

  • Atomically thin materials are crucial for developing next-generation electronics.
  • Ultrashort electronic devices are expected to exhibit ballistic nonlinear behavior for ultrafast applications.
  • Evidence for intrinsic nonlinear ballistic transport in atomically thin conductors has been limited.

Purpose of the Study:

  • To investigate and demonstrate intrinsic nonlinear ballistic transport in ultrashort single-layer graphene devices.
  • To compare the transport behavior of single-layer graphene with bilayer graphene in ultrashort devices.
  • To explore the potential of this phenomenon for future high-speed electronic applications.

Main Methods:

  • Fabrication of ultrashort electronic devices using single-layer and bilayer graphene channels.
  • Measurement of nonlinear electron transport characteristics at room temperature.
  • Quantitative analysis of transport data to identify ballistic nonlinear behavior.

Main Results:

  • Demonstrated quantitative agreement with intrinsic ballistic transport in single-layer graphene devices.
  • Observed distinct nonlinear transport behavior in single-layer graphene compared to bilayer graphene.
  • Confirmed nonlinear ballistic response under ambient conditions (room temperature, zero magnetic field, non-ultrahigh vacuum).

Conclusions:

  • Single-layer graphene exhibits intrinsic nonlinear ballistic transport, differing significantly from bilayer graphene.
  • The number of layers in atomically thin materials critically impacts nonlinear ballistic behavior in ultrashort devices.
  • The developed nanogap technology is promising for creating extremely scaled, high-speed atomically thin electronics.