Size quantization in planar graphene-based heterostructures: Pseudospin splitting, interface states, and excitons

@article{Ratnikov2012SizeQI,
  title={Size quantization in planar graphene-based heterostructures: Pseudospin splitting, interface states, and excitons},
  author={Pavel V. Ratnikov and A. P. Silin},
  journal={Journal of Experimental and Theoretical Physics},
  year={2012},
  volume={114},
  pages={512-528}
}
A planar quantum-well device made of a gapless graphene nanoribbon with edges in contact with gapped graphene sheets is examined. The size-quantization spectrum of charge carriers in an asymmetric quantum well is shown to exhibit a pseudospin splitting. Interface states of a new type arise from the crossing of dispersion curves of gapless and gapped graphene materials. The exciton spectrum is calculated for a planar graphene quantum well. The effect of an external electric field on the exciton… 
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References

SHOWING 1-10 OF 108 REFERENCES
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.
The electronic properties of graphene
Graphene is the first example of truly two‐dimensional crystals – it's just one layer of carbon atoms. It turns out that graphene is a gapless semiconductor with unique electronic properties
Spin-filtered edge states and quantum Hall effect in graphene.
TLDR
It is shown that spin splitting of the zeroth Landau level gives rise to counterpropagating modes with opposite spin polarization, which lead to a rich variety of spin current states, depending on the spin-flip rate.
Chaotic Dirac Billiard in Graphene Quantum Dots
TLDR
This work reports on electron transport in quantum dot devices carved entirely from graphene, demonstrating the possibility of molecular-scale electronics based on graphene.
Substrate-induced band gap in graphene on hexagonal boron nitride: Ab initio density functional calculations
We determine the electronic structure of a graphene sheet on top of a lattice-matched hexagonal boron nitride (h-BN) substrate using ab initio density functional calculations. The most stable
Substrate-induced bandgap opening in epitaxial graphene.
TLDR
It is shown that when graphene is epitaxially grown on SiC substrate, a gap of approximately 0.26 eV is produced and it is proposed that the origin of this gap is the breaking of sublattice symmetry owing to the graphene-substrate interaction.
Resonant Tunneling through double-bended Graphene Nanoribbons
We investigate theoretically resonant tunneling through double-bended graphene nanoribbon (GNR) structures, i.e., armchair-edged GNRs (AGNRs) in between two semi-infinite zigzag GNR leads. Our
Detection of valley polarization in graphene by a superconducting contact.
TLDR
This work shows how Andreev reflection can be used to detect the valley polarization of edge states produced by a magnetic field, in the absence of intervalley relaxation.
Giant intrinsic carrier mobilities in graphene and its bilayer.
TLDR
Measurements show that mobilities higher than 200 000 cm2/V s are achievable, if extrinsic disorder is eliminated and a sharp (thresholdlike) increase in resistivity observed above approximately 200 K is unexpected but can qualitatively be understood within a model of a rippled graphene sheet in which scattering occurs on intraripple flexural phonons.
Dirac cones and minigaps for graphene on Ir(111).
Epitaxial graphene on Ir(111) prepared in excellent structural quality is investigated by angle-resolved photoelectron spectroscopy. It clearly displays a Dirac cone with the Dirac point shifted only
...
...