Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Topological Polaritons in a Quantum Spin Hall Cavity   We study the topological structure of matter-light excitations, so called
polaritons, in a quantum spin Hall insulator coupled to photonic cavity modes.
We identify a topological invariant in the presence of time reversal (TR)
symmetry, and demonstrate the existence of a TR-invariant topological phase. We
find protected helical edge states with energies below the lower polariton
branch and characteristic uncoupled excitonic states, both detectable by
optical techniques. Applying a Zeeman field allows us to relate the topological
index to the double coverage of the Bloch sphere by the polaritonic pseudospin.

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The categories of this paper are: hep-ex
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The categories of this paper are: acc-phys
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The categories of this paper are: hep-ph
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The categories of this paper are: eess
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The categories of this paper are: alg-geom
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The categories of this paper are: patt-sol
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The categories of this paper are: physics
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The categories of this paper are: bayes-an
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The categories of this paper are: plasm-ph
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The categories of this paper are: hep-lat
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The categories of this paper are: funct-an
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The categories of this paper are: atom-ph
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The categories of this paper are: nucl-th
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The categories of this paper are: dg-ga
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The categories of this paper are: gr-qc
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The categories of this paper are: adap-org