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Manipulation of Dirac cones in intercalated epitaxial …

2020-12-28 · The unique Dirac cone of graphene near the K point reappeared as the graphite layer was intercalated by these metals at a coverage of 3/8 ML. Furthermore, our results show that metal intercalation leads to n-type doping of graphene. The bands contributed from graphene exhibit small splitting after intercalation, whereas the bands contributed ...

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Plasmonic Dirac cone in twisted bilayer graphene

Plasmonic Dirac cone in twisted bilayer graphene Phys. Rev. Lett. Luis Brey, T. Stauber, T. Slipchenko, and L. Martín-Moreno Accepted 16 November 2020. Abstract. Abstract. We discuss plasmons of biased twisted bilayer graphene when the Fermi level lies inside the gap. The collective excitations are a network of chiral edge plasmons (CEP ...

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Plasmonic Dirac cone in twisted bilayer graphene

Plasmonic Dirac cone in twisted bilayer graphene Phys. Rev. Lett. Luis Brey, T. Stauber, T. Slipchenko, and L. Martín-Moreno Accepted 16 November 2020. Abstract. Abstract. We discuss plasmons of biased twisted bilayer graphene when the Fermi level lies inside the gap. The collective excitations are a network of chiral edge plasmons (CEP ...

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Condensed concepts: The Dirac cone in graphene is …

2020-12-19 · The Dirac cone in graphene is emergent The nature of the gapless excitations in a quantum many-body system is an emergent property, including underlying order. A simple "classical" example is that the sound waves in crystals result from the breaking of continuous translational symmetry.

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Crystals | Free Full-Text | Dirac Cones in Graphene ...

The 2D outlook of graphene and similar layers has initiated a number of theoretical considerations of electronic structure that are both interesting and exciting, but applying these ideas to real layered systems, in terms of a model 2D system, must be done with extreme care. In the present review, we will discuss the applicability of the 2D concept with examples of peculiarities of electronic ...

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Dirac electrons in a dodecagonal graphene …

The color of each Dirac cone indicates whether the Dirac cone originates mainly from the states in the upper (red) or the lower (blue) graphene layer. The intensity of each Dirac cone indicates the scattering intensity plotted on a log scale. The intensities of the Dirac cones near the Γ point were magnified by a factor of 10 9. Letters A and ...

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Dirac Dispersion in Two-Dimensional Photonic Crystals

The Dirac cone dispersion in graphene is generated by two degrees of freedom, frequently formulated as two components of a pseudospin. These two degrees of freedom are actually the amplitude of the wave functions on sites and of the carbon atoms within the unit cell of graphene.

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Intro - Topology in Condensed Matter

2020-6-7 · Dirac cones in graphene¶ In the last chapter we saw how it is possible to obtain a quantum Hall state by coupling one-dimensional systems. At the end, our recipe was to first obtain a Dirac cone, add a mass term to it and finally to make this mass change sign.

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PAI-graphene: A new topological semimetallic two ...

2020-12-1 · As shown in Fig. 3(a), the valence band maximum (VBM) and conduction band minimum (CBM) of PAI-graphene meet at the Fermi level between the Y and Γ points and form a distorted Dirac cone. In the first BZ, there are two Dirac cones, one is between Y and Γ, and the other one is its centrosymmetric Dirac cone between Y′ and Γ points. The DOS ...

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Physics - Dirac Cones in Boron’s Version of Graphene

Graphene’s two-dimensional honeycomb lattice has symmetry properties that lead to gapless points where the conduction and valence bands meet. The bands around these points have a cone shape, which induces electronic excitations—called Dirac fermions—that behave as if they were massless.

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rare two-dimensional materials with Dirac cones | …

Graphene on Al, Ag, Cu, Au, and Pt surfaces which has weak adsorption (physisorption, E b < 0.5 eV) preserves the Dirac-cone structure and shows n- or p-doping because of charge transfer. However, graphene interacts strongly with Co, Ni, Pd, and Ti (chemsorption, E b > 0.8 eV) by p-d hybridization, leading to an opened band gap of graphene ...

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p Orbital Flat Band and Dirac Cone in the Electronic ...

2020-10-27 · The linear energy-wave vector dispersion (Dirac cone) around the (K, K′) points is responsible for the electronic properties of graphene. (3) We remark that bilayer graphene twisted at magic angles offers exciting physics whereby interlayer coupling and interacting electrons result in a flat band and unconventional superconductivity.

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Coexistence of Dirac cones and Kagome flat bands in …

2016-11-1 · The Fermi velocity of the Dirac cone is one hundred times lower than that of graphene because of the hexagonally arranged phenalenyl units with large interunit spacing. Simultaneously, flat dispersion bands emerge just below and above E F arising from the highest occupied (HO) and lowest unoccupied (LU) states of the phenyl units, respectively ...

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Coexistence of Dirac cones and Kagome flat bands in …

2016-11-1 · The Fermi velocity of the Dirac cone is one hundred times lower than that of graphene because of the hexagonally arranged phenalenyl units with large interunit spacing. Simultaneously, flat dispersion bands emerge just below and above E F arising from the highest occupied (HO) and lowest unoccupied (LU) states of the phenyl units, respectively ...