Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: $d_{xz/yz}$ Orbital Subband Structures and Chiral Orbital Angular
  Momentum in the (001) Surface States of SrTiO$_3$   We have performed angle resolved photoemission spectroscopy (ARPES)
experiments on the surface states of SrTiO$_3$(001) using linearly and
circularly polarized light to investigate the subband structures of
out-of-plane $d_{xz/yz}$ orbitals and chiral orbital angular momentum (OAM).
The data taken in the first Brillouin zone reveal new subbands for $d_{xz/yz}$
orbitals with Fermi wave vectors of 0.25 and 0.45 $\mathrm{\AA}^{-1}$ in
addition to the previously reported ones. As a result, there are at least two
subbands for all the Ti 3d t$_{2g}$ orbitals. Our circular dichroism ARPES data
is suggestive of a chiral OAM structure in the surface states and may provide
clues to the origin of the linear Rashba-like surface band splitting.

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The categories of this paper are: ao-sci
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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: hep-th
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The categories of this paper are: quant-ph
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The categories of this paper are: cmp-lg
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The categories of this paper are: chem-ph
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The categories of this paper are: chao-dyn
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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: solv-int
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The categories of this paper are: eess
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The categories of this paper are: comp-gas
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The categories of this paper are: hep-ex
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The categories of this paper are: physics
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The categories of this paper are: gr-qc