Abstract
Strong light-matter interactions enable unique nonlinear and quantum phenomena at moderate light intensities. Within the last years, polaritonic metasurfaces emerged as a viable candidate for realization of such regimes. In particular, planar photonic structures integrated with 2D excitonic materials, such as transition metal dichalcogenides (TMD), can support exciton polaritons – half-light half-matter quasiparticles. Here, we explore topological exciton polaritons which are formed in a suitably engineered all-dielectric topological photonic metasurface coupled to TMD monolayers. We experimentally demonstrate the transition of topological charge from photonic to polaritonic bands with the onset of strong coupling regime and confirm the presence of one-way spin-polarized edge topological polaritons. The proposed system constitutes a promising platform for photonic/solid-state interfaces for valleytronics and spintronics.
Highlights
Topological photonics has undergone a tremendous growth in the past years as various platforms from microwave to optical spectral ranges were used for implementation of topological phases of light[1,2]
We experimentally demonstrate the transfer of topological charge from photonic to polaritonic mode and one-way propagation of the edge topological polaritons
It represents a Si photonic metasurface with a honeycomb shrink-expand lattice design that is based on the one proposed for a topological quantum optical interface[9]. We adjusted this design to support leaky topological edge modes near the exciton frequency in MoSe2 (1.65 eV at 7K). These samples were fabricated by patterning Silicon on Insulator (SOI) substrates with the use of e-beam lithography followed by reactive ion etching
Summary
Topological photonics has undergone a tremendous growth in the past years as various platforms from microwave to optical spectral ranges were used for implementation of topological phases of light[1,2]. We realize topolaritonic spin-Hall phase that does not require magnetic field in a topological metasurface based on planar Si photonic structure strongly coupled to excitons in TMD monolayers.
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