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Physics Seminar

Dirac cones and artificial magnetic fields in photonic lattices

Speaker: Dr Alberto Amo (Laboratoire PhLAM, CNRS – University of Lille)
Date: Wednesday 8 January 2020
Time: 15:00
Venue: N/3.28

The transport properties of Dirac materials arise from the linear crossings in their band structure. 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 [1]. In this presentation we will review our latest experiments showing the emergence of tilted Dirac cones, photonic Landau levels and type-III Dirac cones [2]. To do so, we take advantage of the topological phase transitions induced in lattices of photonic microresonators with engineered artificial strain.

[1] M. Milicevic, T. Ozawa, G. Montambaux, I. Carusotto, E. Galopin, A. Lemaître, L. Le Gratiet, I. Sagnes, J. Bloch, and A. Amo, Orbital Edge States in a Photonic Honeycomb Lattice, Phys. Rev. Lett. 118, 107403 (2017). [2] M. Milicevic, G. Montambaux, T. Ozawa, O. Jamadi, B. Real, I. Sagnes, A. Lemaître, L. Le Gratiet, A. Harouri, J. Bloch, and A. Amo, Type-III and Tilted Dirac Cones Emerging from Flat Bands in Photonic Orbital Graphene, Phys. Rev. X 9, 31010 (2019).