Direct Observation of Dirac Cones and a Flatband in a Honeycomb Lattice for Polaritons

Year: 2014

Authors: Jacqmin T., Carusotto I., Sagnes I., Abbarchi M., Solnyshkov D. D., Malpuech G., Galopin E.,
Lemaître A., Bloch J., Amo A.

Autors Affiliation: Laboratoire de Photonique et Nanostructures, CNRS/LPN, Route de Nozay, 91460 Marcoussis, France; INO-CNR BEC Center and Dipartimento di Fisica, Università di Trento, I-38123 Povo, Italy; Institut Pascal, PHOTON-N2, Clermont Université, Université Blaise Pascal, CNRS, 24 avenue des Landais, 63177 Aubière Cedex, France

Abstract: Two-dimensional lattices of coupled micropillars etched in a planar semiconductor microcavity offer a workbench to engineer the band structure of polaritons. We report experimental studies of honeycomb lattices where the polariton low-energy dispersion is analogous to that of electrons in graphene. Using energy-resolved photoluminescence, we directly observe Dirac cones, around which the dynamics of polaritons is described by the Dirac equation for massless particles. At higher energies, we observe p orbital bands, one of them with the nondispersive character of a flatband. The realization of this structure which holds massless, massive, and infinitely massive particles opens the route towards studies of the interplay of dispersion, interactions, and frustration in a novel and controlled environment.


Volume: 112 (11)      Pages from: 116402  to: 116402

More Information: This work was supported by the French RENATECH, the ANR-11-BS10-001 contract \”QUANDYDE,\” the RTRA Triangle de la Physique (Contract \”Boseflow1D\”), the FP7 ITNs \”Clermont4\” (235114), the FP7 IRSES \”Polaphen\” (246912), the POLATOM ESF Network, the Labex Nanosaclay, and the ERC (Honeypol and QGBE).
DOI: 10.1103/PhysRevLett.112.116402

Citations: 351
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