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Faculty Candidate CAMP: Topological nanophotonics
Add to Calendar 2024-02-26T20:30:00 2024-02-26T21:30:00 UTC Faculty Candidate CAMP: Topological nanophotonics 339 Davey Laboratory
Start DateMon, Feb 26, 2024
3:30 PM
End DateMon, Feb 26, 2024
4:30 PM
Presented By
Li He, University of Pennsylvania
Event Series: Faculty Candidate CAMP Seminar

Over the past decades, topology has emerged as a major research direction in condensed matter
physics, with the most notable achievement being the discovery of topological insulators. Applying
topological considerations to photonic systems has led to the realization of a variety of photonic
topological states, enabling new ways to control the flow of light. Yet, many crucial properties
intrinsic to photonic systems such as optical nonlinearity and light-matter interactions have been
largely overlooked in the prior studies in topological photonics. In this talk, I will present our
recent work in exploring the role of optical nonlinearity and quantum light-matter interactions in
topological physics. In the first part, I will present our recent theoretical and experimental results
towards observing photonic Floquet Chern insulators in driven nonlinear photonic crystals, where
nontrivial band topology can be induced with designed driving fields [1-4]. In the second part, I
will show strong exciton-photon interactions in 2D TMD materials can completely modify the
energy dispersion, leading to topological exciton-polaritons with protected chiral edge states on
the boundary [5]. Finally, I will present an outlook for the experimental realizations of topological
and quantum exciton-polaritons [6] by combining 2D quantum materials with nanophotonics.
1. Nature Communications 10, 4194 (2019)
2. arXiv: 2304.09385 (2023)
3. Physical Review Letters 126, 113901 (2021)
4. Physical Review Letters 129, 063902 (2022)
5. Physical Review Letters 130, 043801 (2023)
6. arXiv:2311.03750 (2023)