Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Experimental observation of topological exciton-polaritons in transition
  metal dichalcogenide monolayers   The rise of quantum science and technologies motivates photonics research to
seek new platforms with strong light-matter interactions to facilitate quantum
behaviors at moderate light intensities. One promising platform to reach such
strong light-matter interacting regimes is offered by polaritonic metasurfaces,
which represent ultrathin artificial media structured on nano-scale and
designed to support polaritons - half-light half-matter quasiparticles.
Topological polaritons, or 'topolaritons', offer an ideal platform in this
context, with unique properties stemming from topological phases of light
strongly coupled with matter. Here we explore polaritonic metasurfaces based on
2D transition metal dichalcogenides (TMDs) supporting in-plane polarized
exciton resonances as a promising platform for topological polaritonics. We
enable a spin-Hall topolaritonic phase by strongly coupling valley polarized
in-plane excitons in a TMD monolayer with a suitably engineered all-dielectric
topological photonic metasurface. We first show that the strong coupling
between topological photonic bands supported by the metasurface and excitonic
bands in MoSe2 yields an effective phase winding and transition to a
topolaritonic spin-Hall state. We then experimentally realize this phenomenon
and confirm the presence of one-way spin-polarized edge topolaritons. Combined
with the valley polarization in a MoSe2 monolayer, the proposed system enables
a new approach to engage the photonic angular momentum and valley degree of
freedom in TMDs, offering a promising platform for photonic/solid-state
interfaces for valleytronics and spintronics.

28
The categories of this paper are: alg-geom
1
The categories of this paper are: cs
26
The categories of this paper are: bayes-an
34
The categories of this paper are: chem-ph
31
The categories of this paper are: ao-sci
29
The categories of this paper are: funct-an
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The categories of this paper are: cmp-lg
11
The categories of this paper are: hep-lat
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The categories of this paper are: q-fin
14
The categories of this paper are: math-ph
5
The categories of this paper are: gr-qc
10
The categories of this paper are: q-bio
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The categories of this paper are: patt-sol
7
The categories of this paper are: hep-th
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The categories of this paper are: solv-int
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The categories of this paper are: stat