Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Giant Rashba Splitting in CH3NH3PbBr3 Organic-Inorganic Perovskite   As they combine decent mobilities with extremely long carrier lifetimes,
organic-inorganic perovskites have opened a whole new field in
opto\-electronics. Measurements of their underlying electronic structure,
however, are still lacking. Using angle-resolved photoelectron spectroscopy, we
measure the valence band dispersion of single-crystal CH$_3$NH$_3$PbBr$_3$. The
dispersion of the highest energy band is extracted applying a modified leading
edge method, which accounts for the particular density of states of
organic-inorganic perovskites. The surface Brillouin zone is consistent with
bulk-terminated surfaces both in the low-temperature orthorhombic and the
high-temperature cubic phase. In the low-temperature phase, we find a
ring-shaped valence band maximum with a radius of 0.043 {\AA}$^{-1}$, centered
around a 0.16 eV deep local minimum in the dispersion of the valence band at
the high-symmetry point. Intense circular dichroism is observed. This
dispersion is the result of strong spin-orbit coupling. Spin-orbit coupling is
also present in the room-temperature phase. The coupling strength is one of the
largest reported so far.

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The categories of this paper are: hep-th
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The categories of this paper are: nucl-ex
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The categories of this paper are: chao-dyn
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The categories of this paper are: q-alg
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The categories of this paper are: cmp-lg
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The categories of this paper are: cs
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The categories of this paper are: solv-int
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The categories of this paper are: q-bio
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The categories of this paper are: nlin
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The categories of this paper are: adap-org
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The categories of this paper are: hep-lat
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The categories of this paper are: physics
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The categories of this paper are: comp-gas
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The categories of this paper are: q-fin
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The categories of this paper are: patt-sol
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The categories of this paper are: mtrl-th