Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: ARPES/STM study of the surface terminations and 5$f$-electron character
  in URu$_2$Si$_2$   Hidden order in URu$_2$Si$_2$ has remained a mystery now entering its 4th
decade. The importance of resolving the nature of the hidden order has
stimulated extensive research. Here we present a detailed characterization of
different surface terminations in URu$_2$Si$_2$ by angle-resolved photoemission
spectroscopy, in conjunction with scanning tunneling spectroscopy and DMFT
calculations that may unveil a new piece of this puzzle. The U-terminated
surface is characterized by an electron-like band around the $\bar{X}$ point,
while a hole-like band for the Si-terminated surface. We also investigate
temperature evolution of the electronic structure around the $\bar{X}$ point
from 11 K up to 70 K, and did not observe any abrupt change of the electronic
structure around the coherence temperature (55 K). The $f$ spectral weight
gradually weakens upon increasing temperature, still some $f$ spectral weight
can be found above this temperature. Our results suggest that surface
terminations in URu$_2$Si$_2$ are an important issue to be taken into account
in future work.

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The categories of this paper are: hep-lat
35
The categories of this paper are: mtrl-th
17
The categories of this paper are: q-fin
29
The categories of this paper are: funct-an
31
The categories of this paper are: ao-sci
10
The categories of this paper are: q-bio
20
The categories of this paper are: acc-phys
15
The categories of this paper are: nucl-ex
8
The categories of this paper are: hep-ex
26
The categories of this paper are: bayes-an
21
The categories of this paper are: adap-org
14
The categories of this paper are: math-ph
12
The categories of this paper are: nucl-th
36
The categories of this paper are: cmp-lg
25
The categories of this paper are: patt-sol
33
The categories of this paper are: plasm-ph