Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Ultrafast Structure Switching through Nonlinear Phononics   We describe an ultrafast coherent control of the transient structural
distortion arising from nonlinear phononics in ErFeO$_3$. Using density
functional theory, we calculate the structural properties as input to an
anharmonic phonon model that describes the response of the system to a pulsed
optical excitation. We find that the trilinear coupling of two orthogonal
infrared-active phonons to a Raman-active phonon causes a transient distortion
of the lattice. The direction of the distortion is determined by the
polarization of the exciting light, suggesting a route to nonlinear phononic
lattice control and switching. Since the occurrence of the coupling is
determined by the symmetry of the system we propose that it is a universal
feature of orthorhombic and tetragonal perovskites.

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The categories of this paper are: hep-ph
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The categories of this paper are: cmp-lg
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The categories of this paper are: math
21
The categories of this paper are: adap-org
34
The categories of this paper are: chem-ph
1
The categories of this paper are: cs
11
The categories of this paper are: hep-lat
30
The categories of this paper are: q-alg
13
The categories of this paper are: quant-ph
24
The categories of this paper are: dg-ga
25
The categories of this paper are: patt-sol
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The categories of this paper are: nlin
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The categories of this paper are: stat
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The categories of this paper are: gr-qc
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The categories of this paper are: hep-ex
26
The categories of this paper are: bayes-an