Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Direct Observation of the Topological Surface States in Lead-Based
  Ternary Telluride Pb(Bi1-xSbx)2Te4   We have performed angle-resolved photoemission spectroscopy on
Pb(Bi1-xSbx)2Te4, which is a member of lead-based ternary tellurides and has
been theoretically proposed as a candidate for a new class of three-dimensional
topological insulators (TIs). In PbBi2Te4, we found a topological surface state
with a hexagonally deformed Dirac-cone band dispersion, indicating that this
material is a strong TI with a single topological surface state at the
Brillouin-zone center. Partial replacement of Bi with Sb causes a marked change
in the Dirac carrier concentration, leading to the sign change of Dirac
carriers from n-type to p-type. The Pb(Bi1-xSbx)2Te4 system with tunable Dirac
carriers thus provides a new platform for investigating exotic topological
phenomena.

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The categories of this paper are: q-alg
9
The categories of this paper are: nlin
14
The categories of this paper are: math-ph
21
The categories of this paper are: adap-org
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The categories of this paper are: atom-ph
15
The categories of this paper are: nucl-ex
3
The categories of this paper are: physics
13
The categories of this paper are: quant-ph
0
The categories of this paper are: hep-ph
16
The categories of this paper are: stat
7
The categories of this paper are: hep-th
29
The categories of this paper are: funct-an
6
The categories of this paper are: astro-ph
26
The categories of this paper are: bayes-an
17
The categories of this paper are: q-fin
36
The categories of this paper are: cmp-lg