Next CQD Colloquium (funded by STRUCTURES) will be given by Dr. Sylvain Ravets, Université Paris-Saclay
Please note the place and time: Wednesday, 11th of June at 4:30 p.m., PI, INF 226, K 1-3, Goldbox
The main talk will be given by Dr. Sylvain Ravets about:
Title:Synthetic Polariton Matter: Hamiltonian Tomography and Optical Nonlinearities
Abstract:
Exciton-polaritons are hybrid quasiparticles arising from strong coupling between cavity photons and excitons in semiconductor quantum wells [1]. They offer a versatile platform for engineering synthetic photonic materials with tailored properties. In this talk, I will present recent progress in the design and characterization of polariton lattices, where microcavity pillars are arranged into 1D or 2D arrays to implement tight-binding Hamiltonians.
I will first present a method for Hamiltonian engineering based on the patterning of coupled microcavities, and explain how this allows full control over the lattice geometry and hopping parameters. I will focus on a recently developed measurement technique that enables full reconstruction of the Bloch Hamiltonian, by analyzing the momentum-resolved emission spectra from the lattice. This optical tomography technique provides access to every Bloch mode across the entire Brillouin zone, and enables us to experimentally explore the quantum geometry and topology of polariton lattices.
In the second part of the talk, I will explore how polariton-polariton interactions can be harnessed in such systems [1]. By exploiting the matter component of polaritons, we introduce interaction-induced control over the onsite energies. I will show how this enables the all-optical introduction of a vacancy in a Su–Schrieffer–Heeger (SSH) chain, creating a nonlinear interface for Bogoliubov excitations [2]. This result illustrates how interactions can lead to the emergence of new nonlinear topological phases in driven-dissipative systems [3].
These advances demonstrate the potential of polariton platforms to probe and control synthetic photonic materials.
[1] I. Carusotto, and C. Ciuti, Rev. Mod. Phys. 85, 299 (2013)
[2] Nicolas Pernet, et al., Nature Physics 18, 678 (2022)
[3] D. Solnyshkov, et al., Optical Materials Express 11, Issue 4, 1119 (2021)
The pretalk will be given by Emilio Ramos Rodriguez, PI, Universität Heidelberg
For information about the CQD Colloquium, please see: https://cqd.uni-heidelberg.de/events/cqdcolloquium
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