Measuring Dirac Cones in a Subwavelength Metamaterial

Simon Yves 1 Thomas Berthelot 2, 3 Mathias Fink 1 Geoffroy Lerosey 1 Fabrice Lemoult 1
2 LICSEN - Laboratoire Innovation en Chimie des Surfaces et NanoSciences
NIMBE UMR 3685 - Nanosciences et Innovation pour les Matériaux, la Biomédecine et l'Energie (ex SIS2M)
Abstract : The exciting discovery of bi-dimensional systems in condensed matter physics has triggered the search of their photonic analogues. In this letter, we describe a general scheme to reproduce some of the systems ruled by a tight-binding Hamiltonian in a locally resonant metamaterial: by specifically controlling the structure and the composition it is possible to engineer the band structure at will. We numerically and experimentally demonstrate this assertion in the microwave domain by reproducing the band structure of graphene, the most famous example of those 2D-systems, and by accurately extracting the Dirac cones. This is a direct evidence that opting for a crystalline description of those sub-wavelength scaled systems, as opposed to the usual description in terms of effective parameters, makes them a really convenient tabletop platform to investigate the tantalizing challenges that solid-state physics offer.
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Submitted on : Tuesday, February 5, 2019 - 5:03:25 PM
Last modification on : Thursday, April 4, 2019 - 1:30:03 AM

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Simon Yves, Thomas Berthelot, Mathias Fink, Geoffroy Lerosey, Fabrice Lemoult. Measuring Dirac Cones in a Subwavelength Metamaterial. Physical Review Letters, American Physical Society, 2018, 121 (26), pp.267601. 〈https://journals.aps.org/prl/abstract/10.1103/PhysRevLett.121.267601〉. 〈10.1103/PhysRevLett.121.267601〉. 〈cea-02008500〉

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