Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Acousto-optic effects of surface acoustic waves in semiconductor quantum
  well structures   We report on recent experiments investigating the modification of the
inter-band optical response of a piezoelectric semiconductor quantum well
structure under the influence of intense short period surface acoustic waves.
Experimentally, we study the photoluminescence (PL) of an undoped strained
InGaAs/GaAs quantum well on which surface acoustic waves are propagated in the
GHz regime. We observe a pronounced influence on the PL, both in intensity as
well as in energetic position: Above a critical acoustic power density and
corresponding lateral piezoelectric field strength, we observe a quenching of
the excitons resulting in a strong decrease of the PL intensity. Using two
transducers in a cavity resonator geometry, we can create a standing surface
acoustic wave and hence control the nature and efficiency of the acoustic
transport of the photoexcited electrons and holes.

9
The categories of this paper are: nlin
21
The categories of this paper are: adap-org
10
The categories of this paper are: q-bio
36
The categories of this paper are: cmp-lg
30
The categories of this paper are: q-alg
33
The categories of this paper are: plasm-ph
28
The categories of this paper are: alg-geom
29
The categories of this paper are: funct-an
8
The categories of this paper are: hep-ex
37
The categories of this paper are: supr-con
13
The categories of this paper are: quant-ph
14
The categories of this paper are: math-ph
11
The categories of this paper are: hep-lat
6
The categories of this paper are: astro-ph
2
The categories of this paper are: math
32
The categories of this paper are: atom-ph