Probing the Magnetism of Topological End-States in 5-Armchair Graphene Nanoribbons.

@article{Lawrence2020ProbingTM,
  title={Probing the Magnetism of Topological End-States in 5-Armchair Graphene Nanoribbons.},
  author={J. Lawrence and Pedro Brandimarte and Alejandro Berdonces‐Layunta and Mohammed S G Mohammed and A. Grewal and C. Leon and D. S{\'a}nchez-Portal and D. G. de Oteyza},
  journal={ACS nano},
  year={2020}
}
We extensively characterize the electronic structure of ultra-narrow graphene nanoribbons (GNRs) with armchair edges and zig-zag termini that have 5 carbon atoms across their width (5-AGNRs), as synthesised on Au(111). Scanning tunnelling spectroscopy measurements on the ribbons, recorded on both the metallic substrate and a decoupling NaCl layer, show well-defined dispersive bands and in-gap states. In combination with theoretical calculations, we show how these in-gap states are topological… Expand
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References

SHOWING 1-10 OF 49 REFERENCES
Topological Phases in Graphene Nanoribbons: Junction States, Spin Centers, and Quantum Spin Chains.
TLDR
It is shown that semiconducting graphene nanoribbons of different width, edge, and end termination (synthesizable from molecular precursors with atomic precision) belong to different electronic topological classes and that localized junction states developed between two GNRs of distinct topology may be tuned by lateral junction geometry. Expand
Ultra-narrow metallic armchair graphene nanoribbons
TLDR
This work synthesizes the narrowest possible GNR belonging to this family (five carbon atoms wide, N=5), and studies the evolution of the electronic bandgap and orbital structure of GNR segments as a function of their length using low-temperature scanning tunnelling microscopy and density-functional theory calculations. Expand
Electronic band dispersion of graphene nanoribbons via Fourier-transformed scanning tunneling spectroscopy
The electronic structure of atomically precise armchair graphene nanoribbons of width N=7 (7-AGNRs) are investigated by scanning tunneling spectroscopy (STS) on Au(111). We record the standing wavesExpand
Giant edge state splitting at atomically precise graphene zigzag edges
TLDR
This work focuses on atomically precise graphene nanoribbons whose two short zigzag edges host exactly one localized electron each, and reflects the dominant role of electron–electron interactions in these localized states. Expand
On-Surface Synthesis and Characterization of 9-Atom Wide Armchair Graphene Nanoribbons.
TLDR
The synthesis of an armchair graphene nanoribbon with a width of nine carbon atoms on Au(111) through surface-assisted aryl-aryl coupling and subsequent cyclodehydrogenation of a properly chosen molecular precursor is reported. Expand
Energy gaps in graphene nanoribbons.
TLDR
The authors' ab initio calculations show that the origin of energy gaps for GNRs with armchair shaped edges arises from both quantum confinement and the crucial effect of the edges, which differs from the results of simple tight-binding calculations or solutions of the Dirac's equation based on them. Expand
Electronic structure of atomically precise graphene nanoribbons.
TLDR
The electronic band gap and dispersion of the occupied electronic bands of atomically precise graphene nanoribbons fabricated via on-surface synthesis are reported on and are in quantitative agreement with theoretical predictions that include image charge corrections accounting for screening by the metal substrate and confirm the importance of electron-electron interactions in graphene nan oribbons. Expand
On-surface synthesis of graphene nanoribbons with zigzag edge topology
TLDR
It is expected that the availability of ZGNRs will enable the characterization of their predicted spin-related properties, such as spin confinement and filtering, and will ultimately add the spin degree of freedom to graphene-based circuitry. Expand
Width-Dependent Band Gap in Armchair Graphene Nanoribbons Reveals Fermi Level Pinning on Au(111)
TLDR
The energy level alignment evolution of valence and conduction bands of armchair-oriented graphene nanoribbons (aGNR) as their band gap shrinks with increasing width is reported, and valence bands are found to show Fermi level pinning as the band gap decreases below a threshold value around 1.7 eV. Expand
Mapping the Conductance of Electronically Decoupled Graphene Nanoribbons.
TLDR
It is shown that resonant transport-essential for device applications-can be measured by lifting electronically decoupled GNRs from an ultrathin layer of NaCl, and it is demonstrated that the current decay can be measured with increasing junction length and bias voltage by using a double modulation spectroscopy technique. Expand
...
1
2
3
4
5
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