Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Evidence of photo-induced dynamic competition of metallic and insulating
  phase in a layered manganite   We show evidence that the competition between the antiferromagetic metallic
phase and the charge- and orbital-ordered insulating phase at the reentrant
phase boundary of a layered manganite, LaSr2Mn2O7, can be manipulated using
ultrafast optical excitation. The time-dependent evolution of the Jahn-Teller
superlattice reflection, which indicates the formation of the charge and
orbital order, was measured at different laser fluences. The laser-induced
enhancement and reduction the Jahn-Teller reflection intensity shows a reversal
of sign between earlier (~10 ns) and later (~150 ns) time delays during the
relaxation after photo excitation. This effect is consistent with a scenario
whereby the laser excitation modulates the local competition between the
metallic and the insulating phases.

35
The categories of this paper are: mtrl-th
15
The categories of this paper are: nucl-ex
32
The categories of this paper are: atom-ph
31
The categories of this paper are: ao-sci
26
The categories of this paper are: bayes-an
17
The categories of this paper are: q-fin
33
The categories of this paper are: plasm-ph
0
The categories of this paper are: hep-ph
6
The categories of this paper are: astro-ph
9
The categories of this paper are: nlin
34
The categories of this paper are: chem-ph
5
The categories of this paper are: gr-qc
13
The categories of this paper are: quant-ph
21
The categories of this paper are: adap-org
23
The categories of this paper are: solv-int
27
The categories of this paper are: comp-gas