Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Infrared and Terahertz Spectroscopy of Strongly Correlated Electron
  Systems under Extreme Conditions   Owing to its high brilliance, infrared and terahertz synchrotron radiation
(IR/THz-SR) has emerged as a powerful tool for spectroscopy under extreme
(i.e., technically more difficult) experimental conditions such as high
pressure, high magnetic field, high spatial resolution, and a combination of
these. The methodologies for pressure- and magnetic-field-dependent
spectroscopy and microscopy using IR/THz-SR have advanced rapidly worldwide. By
applying them in strongly correlated electron systems (SCESs), many
experimental studies have been performed on their electronic structures and
phonon/molecular vibration modes under extreme conditions. Here, we review the
recent progress of methodologies of IR/THz-SR spectroscopy and microscopy, and
the experimental results on SCESs and other systems obtained under extreme
conditions.

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The categories of this paper are: hep-ph
8
The categories of this paper are: hep-ex
1
The categories of this paper are: cs
26
The categories of this paper are: bayes-an
13
The categories of this paper are: quant-ph
29
The categories of this paper are: funct-an
2
The categories of this paper are: math
32
The categories of this paper are: atom-ph
30
The categories of this paper are: q-alg
12
The categories of this paper are: nucl-th
24
The categories of this paper are: dg-ga
16
The categories of this paper are: stat
15
The categories of this paper are: nucl-ex
17
The categories of this paper are: q-fin
9
The categories of this paper are: nlin
27
The categories of this paper are: comp-gas