Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Radiative Pattern of Intralayer and Interlayer Excitons in
  Two-Dimensional WS2/WSe2 Heterostructure   Two-dimensional (2D) heterostructures (HS) formed by transition-metal
dichalcogenide (TMDC) monolayers offer a unique platform for the study of
intralayer and interlayer excitons as well as moir\'e-pattern-induced features.
Particularly, the dipolar charge-transfer exciton comprising an electron and a
hole, which are confined to separate layers of 2D semiconductors and
Coulomb-bound across the heterojunction interface, has drawn considerable
attention in the research community. On the one hand, it bears significance for
optoelectronic devices, e.g. in terms of charge carrier extraction from
photovoltaic devices. On the other hand, its spatially indirect nature and
correspondingly high longevity among excitons as well as its out-of-plane
dipole orientation render it attractive for excitonic Bose-Einstein
condensation studies, which address collective coherence effects, and for
photonic integration schemes with TMDCs. Here, we demonstrate the interlayer
excitons' out-of-plane dipole orientation through angle-resolved spectroscopy
of the HS photoluminescence at cryogenic temperatures, employing a
tungsten-based TMDC HS. Within the measurable light cone, the directly-obtained
radiation profile of this species clearly resembles that of an in-plane emitter
which deviates from that of the intralayer bright excitons as well as the other
excitonic HS features recently attributed to artificial superlattices formed by
moir\'e patterns.

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The categories of this paper are: q-fin
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The categories of this paper are: mtrl-th
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The categories of this paper are: acc-phys
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The categories of this paper are: q-alg
3
The categories of this paper are: physics
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The categories of this paper are: chao-dyn
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The categories of this paper are: cmp-lg
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The categories of this paper are: ao-sci
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The categories of this paper are: alg-geom
1
The categories of this paper are: cs
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The categories of this paper are: funct-an
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The categories of this paper are: bayes-an
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The categories of this paper are: solv-int
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The categories of this paper are: hep-lat
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The categories of this paper are: eess
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The categories of this paper are: plasm-ph