Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Anisotropy of the infrared-active phonon modes in the mono-domain state
  of tetragonal SrTiO3 (110)   With infrared and terahertz ellipsometry we investigated the anisotropy of
the infrared active phonon modes in SrTiO3 (110) single crystals in the
tetragonal state below the so-called antiferrodistortive transition at T* = 105
K. In particular, we show that the anisotropy of the oscillator strength of the
so-called R-mode, which becomes weakly infrared active below T*, is a valuable
indicator for the orientation of the structural domains. Our results reveal
that a mono-domain state with the tetragonal axis (c-axis) parallel to the
[001] direction can be created by applying a moderate uniaxial stress of about
2.3 MPa along the [1-10] direction (with a mechanical clamp). The resulting,
intrinsic splitting of the infrared-active phonon modes is reported.

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The categories of this paper are: dg-ga
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The categories of this paper are: eess
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The categories of this paper are: acc-phys
36
The categories of this paper are: cmp-lg
34
The categories of this paper are: chem-ph
18
The categories of this paper are: econ
3
The categories of this paper are: physics
8
The categories of this paper are: hep-ex
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The categories of this paper are: stat
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The categories of this paper are: solv-int
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The categories of this paper are: comp-gas
0
The categories of this paper are: hep-ph
7
The categories of this paper are: hep-th
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The categories of this paper are: plasm-ph
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The categories of this paper are: bayes-an
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The categories of this paper are: nucl-ex