Day / Time
Date(s) - 08/12/2015
13 h 00 min - 14 h 00 min
Laboratoire de Photonique et de Nanostructures, LPN/CNRSRoute de Nozay, 91460 Marcoussis, France
QUANTUM FLUIDS OF LIGHT IN SEMICONDUCTOR LATTICES
Semiconductor microcavities appears today as a new platform to investigate quantum fluids of light. They enable confining in a very small volume both light and electronic excitations (excitons). The resulting strong light-matter coupling gives rise to the formation of hybrid light-matter quasi-particles, named excitonic polaritons.
Excitonic polaritons propagate like photons but strongly interact with their environment via their matter component: they behave as quantum fluids of light, and show fascinating phenomena like superfluidity, nucleation of topological excitations such as quantized vortices… Moreover patterning semiconductor microcavities on a micron scale allows designing lattices for polaritons.
After a general introduction, I will illustrate the diversity of physical problems which can be emulated by engineering artificial lattices for polaritons: Dirac physics in honeycomb lattices, fractal energy spectrum in a quasi-periodic potential or phase frustration in lattices holding a flat-band. The hoping phase between neighbored sites can be tuned via interaction-induced interferences opening the way to the synthesis of artificial gauge fields. Spontaneous formation and optical manipulation of extended polariton condensates, E. Wertz, et al., Nat. Phys. 6, 860 (2010)  Realization of a double barrier resonant tunneling diode for cavity polaritons, H-.S. Nguyen et al., Phys. Rev. Lett. 110, 236601 (2013)  Macroscopic quantum self-trapping and Josephson oscillations of exciton polaritons , M. Abbarchi, et al., Nature Phys. 9, 275 (2013)  Fractal energy spectrum of a polariton gas in a Fibonacci quasi-periodic potential, D. Tanese et al., Phys. Rev. Lett. 112, 146404 (2014)  Direct observation of Dirac cones and a flatband in a honeycomb lattice for polaritons, T. Jacqmin et al., Phys. Rev. Lett. 112, 116402 (2014)  Spin-Orbit Coupling for Photons and Polaritons in Microstructures, V.G. Sala et al., Phys. Rev. X 5, 011034 (2015)  Bosonic condensation in a flat energy band, F. Baboux et al., arXiv:1505.05652 (2015)