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Engineered Hopping Integrals of Bloch Exciton-Polaritons (Re-scheduled)
Speaker Prof. Na Young Kim, University of Waterloo
Date 14 May 2018 (Monday)
Time 16:00 - 17:30
Venue Lecture Theatre H (Lifts 27-28), HKUST

Na Young Kim a,b*

a Institute for Quantum Computing, University of Waterloo, 200 University Ave. West, Waterloo, ON, N2L 3G1, Canada
b Department of Electrical and Computer Engineering, Department of Physics and Astronomy, Department of Chemistry, University of Waterloo, 200 University Ave. West, Waterloo, ON, N2L 3G1, Canada
Perimeter Institute for Theoretical Physics, Waterloo, ON, N2L 2Y5, Canada

* Corresponding author: nayoung.kiim@uwaterloo.ca

Microcavity exciton-polaritons are hybrid quantum quasi-particles as an admixture of cavity photons and quantum-well excitons. We engineer exciton-polariton-lattice systems, where we seek the beauty of non-zero momentum boson order arising from the intrinsic open-dissipative nature of the condensate as well as the topology of lattices. In this work, we quantify the hopping integrals of the lowest-band exciton-polaritons in terms of two physical parameters: nearest-neighbor site distance, d (3,4,5 and 7 𝜇m), and detuning values Δ ( - 19 ~ 9 meV) in engineered two-dimensional honeycomb lattices.  The artificial lattices are formed by an etching-overgrowth technique to module the cavity layer thickness to induce a photon confinement. The lattice potential depths vary 3-5 meV at different Δ values, and we construct the band structures of the exciton-polaritons via a low-power angle-resolved photoluminescence spectroscopy. The hopping integrals of nearest-neighbor and next-nearest neighbor sites in the lowest bands are extracted from the measured band structures by the tight-binding Hamiltonian fittings.