Type-III and Tilted Dirac Cones Emerging from Flat Bands in Photonic Orbital Graphene

By M. Milićević, G. Montambaux, T. Ozawa, O. Jamadi, B. Real, Isabelle Sagnes, A. Lemaître, L. Gratiet, A. Harouri, Jacqueline Bloch and 1 more. Physical Review X, 2018

141 citations recorded by the source corpus.

The extraordinary electronic properties of Dirac materials, the two-dimensional partners of Weyl semimetals, arise from the linear crossings in their band structure. When the dispersion around the Dirac points is tilted, the emergence of intricate transport phenomena has been predicted, such as modified Klein tunnelling, intrinsic anomalous Hall effects and ferrimagnetism. However, Dirac materials are rare, particularly with tilted Dirac cones. Recently, artificial materials whose building blocks present orbital degrees of freedom have appeared as promising candidates for the engineering of exotic Dirac dispersions. Here we take advantage of the orbital structure of photonic resonators arranged in a honeycomb lattice to implement photonic lattices with semi-Dirac, tilted and, most interestingly, type-III Dirac cones that combine flat and linear dispersions. The tilted cones emerge from the touching of a flat and a parabolic band with a non-trivial topological charge. These results open the way to the synthesis of orbital Dirac matter with unconventional transport properties and, in combination with polariton nonlinearities, to the study of topological and Dirac superfluids in photonic lattices.

Subfields: Atomic and Molecular Physics, and Optics, Materials Chemistry

View Paper: https://www.semanticscholar.org/paper/38b2bab9af1d5a17dfd7279a962bf7883f5d587f

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In Atomic and Molecular Physics, and Optics

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Citations in the corpus

Topological photonics (2018, methodology): “Interestingly, homogeneous strain has been employed to synthesize critically tilted Dirac cones in the orbital p bands of lattices of coupled micropillars (Milićević et al., 2018).”