Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Interacting polariton fluids in a monolayer of tungsten disulfide   Atomically thin transition metal dichalcogenides (TMDs) possess a number of
properties that make them attractive for realizing room-temperature polariton
devices. An ideal platform for manipulating polariton fluids within monolayer
TMDs is that of Bloch surface waves, which confine the electric field to a
small volume near the surface of a dielectric mirror. Here we demonstrate that
monolayer tungsten disulfide ($\text{WS}_2$) can sustain Bloch surface wave
polaritons (BSWPs) with a Rabi splitting of 43 meV and propagation constants
reaching 33 $\mu$m. In addition, we evidence strong polariton-polariton
nonlinearities within BSWPs, which manifest themselves as a reversible
blueshift of the lower polariton resonance by up to 12.9$\pm$0.5 meV. Such
nonlinearities are at the heart of polariton devices and have not yet been
demonstrated in TMD polaritons. As a proof of concept, we use the nonlinearity
to implement a nonlinear polariton source. Our results demonstrate that BSWPs
using TMDs can support long-range propagation combined with strong
nonlinearities, enabling potential applications in integrated optical
processing and polaritonic circuits.

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The categories of this paper are: mtrl-th
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The categories of this paper are: ao-sci
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The categories of this paper are: gr-qc
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The categories of this paper are: supr-con
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The categories of this paper are: plasm-ph
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The categories of this paper are: alg-geom
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The categories of this paper are: econ
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The categories of this paper are: nucl-th
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The categories of this paper are: stat
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The categories of this paper are: math
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The categories of this paper are: astro-ph
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The categories of this paper are: q-bio
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The categories of this paper are: hep-th
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The categories of this paper are: math-ph
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The categories of this paper are: adap-org
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The categories of this paper are: cs