Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Observation of Single Dirac Cone Topological Surface State in Compounds
  TlBiTe2 and TlBiSe2 from a New Topological Insulator Family   Angle resolved photoemission spectroscopy (ARPES) studies were performed on
two compounds (TlBiTe$_2$ and TlBiSe$_2$) from a recently proposed three
dimensional topological insulator family in Thallium-based III-V-VI$_2$ ternary
chalcogenides. For both materials, we show that the electronic band structures
are in broad agreement with the $ab$ $initio$ calculations; by surveying over
the entire surface Brillouin zone (BZ), we demonstrate that there is a single
Dirac cone reside at the center of BZ, indicating its topological
non-triviality. For TlBiSe$_2$, the observed Dirac point resides at the top of
the bulk valance band, making it a large gap ($\geq$200$meV$) topological
insulator; while for TlBiTe$_2$, we found there exist a negative indirect gap
between the bulk conduction band at $M$ point and the bulk valance band near
$\Gamma$, making it a semi-metal at proper doping. Interestingly, the unique
band structures of TlBiTe$_2$ we observed further suggest TlBiTe$_2$ may be a
candidate for topological superconductors.

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The categories of this paper are: plasm-ph
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The categories of this paper are: q-alg
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The categories of this paper are: funct-an
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The categories of this paper are: solv-int
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The categories of this paper are: ao-sci
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The categories of this paper are: econ
10
The categories of this paper are: q-bio
5
The categories of this paper are: gr-qc
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The categories of this paper are: q-fin
2
The categories of this paper are: math
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The categories of this paper are: alg-geom
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The categories of this paper are: math-ph
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The categories of this paper are: supr-con
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The categories of this paper are: comp-gas
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The categories of this paper are: astro-ph
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The categories of this paper are: stat