Séminaire DQMP Prof. Jacqueline Bloch

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Date(s) - 08/12/2015
13 h 00 min - 14 h 00 min

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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.

[1] Spontaneous formation and optical manipulation of extended polariton condensates, E. Wertz, et al., Nat. Phys. 6, 860 (2010)

[2] Realization of a double barrier resonant tunneling diode for cavity polaritons, H-.S. Nguyen et al., Phys. Rev. Lett. 110, 236601 (2013)

[3] Macroscopic quantum self-trapping and Josephson oscillations of exciton polaritons , M. Abbarchi, et al., Nature Phys. 9, 275 (2013)

[4] Fractal energy spectrum of a polariton gas in a Fibonacci quasi-periodic potential, D. Tanese et al., Phys. Rev. Lett. 112, 146404 (2014)

[5] Direct observation of Dirac cones and a flatband in a honeycomb lattice for polaritons, T. Jacqmin et al., Phys. Rev. Lett. 112, 116402 (2014)

[6] Spin-Orbit Coupling for Photons and Polaritons in Microstructures, V.G. Sala et al., Phys. Rev. X 5, 011034 (2015)

[7] Bosonic condensation in a flat energy band, F. Baboux et al., arXiv:1505.05652 (2015)

Réalisation : Sur Mesure concept