Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Topological phases of polaritons in a cavity waveguide   We study the unconventional topological phases of polaritons inside a cavity
waveguide, demonstrating how strong light-matter coupling leads to a breakdown
of the bulk-edge correspondence. Namely, we observe an ostensibly topologically
nontrivial phase, which unexpectedly does not exhibit edge states. Our findings
are in direct contrast to topological tight-binding models with electrons, such
as the celebrated Su-Schrieffer-Heeger (SSH) model. We present a theory of
collective polaritonic excitations in a dimerized chain of oscillating dipoles
embedded inside a photonic cavity. The added degree of freedom from the cavity
photons upgrades the system from a typical SSH $\mathrm{SU}(2)$ model into a
largely unexplored $\mathrm{SU}(3)$ model. Tuning the light-matter coupling
strength by changing the cavity size reveals three critical points in parameter
space: when the polariton band gap closes, when the Zak phase changes from
being trivial to nontrivial, and when the edge state is lost. Remarkably, these
three critical points do not coincide, and thus the Zak phase is no longer an
indicator of the presence of edge states. Our discoveries demonstrate some
remarkable properties of topological matter when strongly coupled to light, and
could be important for the growing field of topological nanophotonics.

31
The categories of this paper are: ao-sci
2
The categories of this paper are: math
27
The categories of this paper are: comp-gas
15
The categories of this paper are: nucl-ex
36
The categories of this paper are: cmp-lg
32
The categories of this paper are: atom-ph
3
The categories of this paper are: physics
12
The categories of this paper are: nucl-th
26
The categories of this paper are: bayes-an
16
The categories of this paper are: stat
28
The categories of this paper are: alg-geom
33
The categories of this paper are: plasm-ph
22
The categories of this paper are: chao-dyn
7
The categories of this paper are: hep-th
9
The categories of this paper are: nlin
21
The categories of this paper are: adap-org