Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Stimulated Rayleigh scattering and slow light generation in a
  periodically driven Dirac semimetal Cd$_3$As$_2$   Periodic driving of solids by intense light field has recently attracted a
great deal of interest for Floquet engineering. Despite significant advances in
theory, a comprehensive understanding is still lacking due to limited
experimental realization. Electromagnetic response functions in periodically
driven materials particularly deserve elucidation, both for fundamental science
and potential applications. Here we report on ultrafast multiterahertz
pump-probe spectroscopy of a three-dimensional Dirac semimetal, cadmium
arsenide. We show that stimulated Rayleigh scattering dominates the optical
response under an intense driving field with the assistance of a longitudinal
collective mode. The characteristic dispersive lineshape in the transient
absorption spectrum is accounted for by optical transitions between
light-induced Floquet subbands. We present a convenient model to describe the
macroscopic behavior of this phenomenon. Appearance of stimulated Rayleigh
scattering with an unprecedentedly large refractive index change may pave the
way for slow light generation in conductive solids at room temperature.

23
The categories of this paper are: solv-int
35
The categories of this paper are: mtrl-th
20
The categories of this paper are: acc-phys
8
The categories of this paper are: hep-ex
36
The categories of this paper are: cmp-lg
2
The categories of this paper are: math
37
The categories of this paper are: supr-con
30
The categories of this paper are: q-alg
13
The categories of this paper are: quant-ph
10
The categories of this paper are: q-bio
19
The categories of this paper are: eess
17
The categories of this paper are: q-fin
21
The categories of this paper are: adap-org
18
The categories of this paper are: econ
11
The categories of this paper are: hep-lat
6
The categories of this paper are: astro-ph