Exceptional ballistic transport in epitaxial graphene nanoribbons

@article{Baringhaus2014ExceptionalBT,
  title={Exceptional ballistic transport in epitaxial graphene nanoribbons},
  author={Jens Baringhaus and Ming Ruan and F. Edler and Antonio Tejeda and Muriel Sicot and Amina Taleb-Ibrahimi and An‐Ping Li and Zhigang Jiang and Edward H. Conrad and Claire Berger and Christoph Tegenkamp and Walt A. de Heer},
  journal={Nature},
  year={2014},
  volume={506},
  pages={349-354}
}
Graphene nanoribbons will be essential components in future graphene nanoelectronics. However, in typical nanoribbons produced from lithographically patterned exfoliated graphene, the charge carriers travel only about ten nanometres between scattering events, resulting in minimum sheet resistances of about one kilohm per square. Here we show that 40-nanometre-wide graphene nanoribbons epitaxially grown on silicon carbide are single-channel room-temperature ballistic conductors on a length scale… 

Ballistic tracks in graphene nanoribbons

TLDR
Spatially-resolved two-point probe and conductive AFM measurements are used, supplemented by tight-binding calculations, to image the one-dimensional ballistic transport channels of graphene nanoribbons on SiC substrates.

The importance of edges in reactive ion etched graphene nanodevices

Patterned graphene nanodevices are promising candidates for nano- and quantum-electronics. Low temperature electronic transport in reactive ion etched graphene nanodevices is typically governed by

Size effects in the resistivity of graphene nanoribbons

TLDR
It is shown that the Charge Neutrality point switches polarity below a ribbon width of around 50 nm, and that at this point, the thermal coefficient of resistance is a maximum, and the majority doping type therefore can be controlled by altering ribbon width below 100 nm.

Atomic structure of epitaxial graphene sidewall nanoribbons: flat graphene, miniribbons, and the confinement gap.

TLDR
It is established that nanoscale confinement in the graphene miniribbons is the origin of the local large band gap observed in ARPES, which provides a framework to help understand ballistic transport in sidewall graphene.

Nanoscale imaging of electric pathways in epitaxial graphene nanoribbons

Graphene nanoribbons (GNRs) are considered as major building blocks in future carbon-based electronics. The electronic performance of graphene nanostructures is essentially influenced and determined

Synthesis of quasi-free-standing bilayer graphene nanoribbons on SiC surfaces

TLDR
The experiments reveal that the degree of disorder at the edges increases with the width, indicating that the narrower nanoribbons are more ordered in their edge termination, and the reported approach is a viable route towards the large-scale fabrication of bilayer graphene nanostructures with tailored dimensions and properties for specific applications.

An epigraphene platform for coherent 1D nanoelectronics

Exceptional edge state ballistic transport, first observed in graphene nanoribbons grown on the sidewalls of trenches etched in electronics grade silicon carbide even at room temperature, is shown

Quasi-free-standing bilayer graphene nanoribbons probed by electronic transport

Direct growth of graphene nanostructures by using concepts of self-assembly and intercalation without further lithography and transfer processes is beneficial for their integration into device

Origin of room-temperature single-channel ballistic transport in zigzag graphene nanoribbons

Very recently, it was demonstrated explicitly that a zigzag graphene nanoribbon (GNR) exhibits a conductance of G0/2 (G0 = 2e2/h is the quantum of conductance) even along distances as large as 16 µm

Sub-Nanometer Width Armchair Graphene Nanoribbon Energy Gap Atlas

Extended all-sp2-carbon macromolecules have the potential to replace silicon in integrated nanometer-scale devices. Up to now, studies on the electronic properties of such structures, for example,
...

References

SHOWING 1-10 OF 38 REFERENCES

Scalable templated growth of graphene nanoribbons on SiC.

TLDR
This work demonstrates the self-organized growth of graphene nanoribbons on a templated silicon carbide substrate prepared using scalable photolithography and microelectronics processing, and proves the scalability of this approach by fabricating 10,000 top-gated graphene transistors on a 0.24-cm(2) SiC chip, which is the largest density of graphene devices reported to date.

Ultrathin epitaxial graphite: 2D electron gas properties and a route toward graphene-based nanoelectronics.

We have produced ultrathin epitaxial graphite films which show remarkable 2D electron gas (2DEG) behavior. The films, composed of typically three graphene sheets, were grown by thermal decomposition

Graphene nanoribbons with smooth edges behave as quantum wires.

TLDR
It is reported that one- and two-layer nanoribbon quantum dots made by unzipping carbon nanotubes exhibit well-defined quantum transport phenomena, including Coulomb blockade, the Kondo effect, clear excited states up to ∼20 meV, and inelastic co-tunnelling.

Structured epitaxial graphene: growth and properties

Graphene is generally considered to be a strong candidate to succeed silicon as an electronic material. However, to date, it actually has not yet demonstrated capabilities that exceed standard

Large area and structured epitaxial graphene produced by confinement controlled sublimation of silicon carbide

TLDR
The CCS method is now applied on structured silicon carbide surfaces to produce high mobility nano-patterned graphene structures thereby demonstrating that EG is a viable contender for next-generation electronics.

Electronic Confinement and Coherence in Patterned Epitaxial Graphene

TLDR
The transport properties, which are closely related to those of carbon nanotubes, are dominated by the single epitaxial graphene layer at the silicon carbide interface and reveal the Dirac nature of the charge carriers.

Electronic transport in two-dimensional graphene

We provide a broad review of fundamental electronic properties of two-dimensional graphene with the emphasis on density and temperature dependent carrier transport in doped or gated graphene

Energy band-gap engineering of graphene nanoribbons.

TLDR
It is found that the energy gap scales inversely with the ribbon width, thus demonstrating the ability to engineer the band gap of graphene nanostructures by lithographic processes.

Making angle-resolved photoemission measurements on corrugated monolayer crystals: Suspended exfoliated single-crystal graphene

Free-standing exfoliated monolayer graphene is an ultra-thin flexible membrane, which exhibits out of plane deformation or corrugation. In this paper, a technique is described to measure the band

Interference and Interaction in multi-wall carbon nanotubes

Abstract.We report equilibrium electric resistance R and tunneling spectroscopy (dI/dV)measurements obtained on single multi-wall nanotubes contacted by four metallic Au fingers from above. At low