Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: ARPES Study of X-Point Band Overlaps in LaB$_6$ and SmB$_6$ - Contrast
  to SrB$_6$ and EuB$_6$   In contrast to our recent finding of an X-point band gap in divalent
hexaborides, we report here that angle resolved photoemission spectroscopy
(ARPES) data shows that the gap is absent for trivalent LaB$_6$ and is absent
or nearly so for mixed valent SmB$_6$. This finding demonstrates a nontrivial
evolution of the band structure from divalent to trivalent hexaborides.

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The categories of this paper are: supr-con
11
The categories of this paper are: hep-lat
19
The categories of this paper are: eess
8
The categories of this paper are: hep-ex
0
The categories of this paper are: hep-ph
6
The categories of this paper are: astro-ph
30
The categories of this paper are: q-alg
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The categories of this paper are: comp-gas
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The categories of this paper are: quant-ph
7
The categories of this paper are: hep-th
15
The categories of this paper are: nucl-ex
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The categories of this paper are: solv-int
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The categories of this paper are: econ
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The categories of this paper are: dg-ga
5
The categories of this paper are: gr-qc
22
The categories of this paper are: chao-dyn