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

作者：Jacqmin, T.^*; Carusotto, I.; Sagnes, I.; Abbarchi, M.; Solnyshkov, D. D.; Malpuech, G.; Galopin, E.; Lemaitre, A.; Bloch, J.; Amo, A.

来源：Physical Review Letters, 2014, 112(11): 116402.

DOI：10.1103/PhysRevLett.112.116402

• GRAPHENE
• CONDENSATION
• ELECTRONS
• GASES

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.

• 出版日期2014-3-18