Tunable exciton-polaritons emerging from WS2 monolayer excitons in a photonic lattice at room temperature

L. Lackner (), M. Dusel, O. A. Egorov, B. Han, H. Knopf, F. Eilenberger, S. Schröder, K. Watanabe, T. Taniguchi, S. Tongay, C. Anton-Solanas, S. Höfling and C. Schneider ()
Additional contact information
L. Lackner: Universität Würzburg
M. Dusel: Universität Würzburg
O. A. Egorov: Friedrich Schiller University
B. Han: University of Oldenburg
H. Knopf: Friedrich Schiller University
F. Eilenberger: Friedrich Schiller University
S. Schröder: Fraunhofer-Institute for Applied Optics and Precision Engineering IOF
K. Watanabe: National Institute for Materials Science
T. Taniguchi: National Institute for Materials Science
S. Tongay: Arizona State University
C. Anton-Solanas: University of Oldenburg
S. Höfling: Universität Würzburg
C. Schneider: Universität Würzburg

Nature Communications, 2021, vol. 12, issue 1, 1-6

Abstract: Abstract Engineering non-linear hybrid light-matter states in tailored lattices is a central research strategy for the simulation of complex Hamiltonians. Excitons in atomically thin crystals are an ideal active medium for such purposes, since they couple strongly with light and bear the potential to harness giant non-linearities and interactions while presenting a simple sample-processing and room temperature operability. We demonstrate lattice polaritons, based on an open, high-quality optical cavity, with an imprinted photonic lattice strongly coupled to excitons in a WS2 monolayer. We experimentally observe the emergence of the canonical band-structure of particles in a one-dimensional lattice at room temperature, and demonstrate frequency reconfigurability over a spectral window exceeding 85 meV, as well as the systematic variation of the nearest-neighbour coupling, reflected by a tunability in the bandwidth of the p-band polaritons by 7 meV. The technology presented in this work is a critical demonstration towards reconfigurable photonic emulators operated with non-linear photonic fluids, offering a simple experimental implementation and working at ambient conditions.

Date: 2021
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DOI: 10.1038/s41467-021-24925-9

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