Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Optical and electronic properties of symmetric InAs/InGaAlAs/InP quantum
  dots formed by a ripening process in molecular beam epitaxy: a promising
  system for broad-range single-photon telecom emitters   We present a detailed experimental optical study supported by theoretical
modeling of InAs quantum dots (QDs) embedded in an InAlGaAs barrier
lattice-matched to InP(001) grown with the use of a ripening step in molecular
beam epitaxy. The method leads to the growth of in-plane symmetric QDs of low
surface density, characterized by a multimodal size distribution resulting in a
spectrally broad emission in the range of $1.4-2.0$ $\mu$m, essential for many
near-infrared photonic applications. We find that, in contrast to the InAs/InP
system, the multimodal distribution results here from a two-monolayer
difference in QD height between consecutive families of dots. This may stem
from the long-range ordering in the quaternary barrier alloy that stabilizes QD
nucleation. Measuring the photoluminescence (PL) lifetime of the spectrally
broad emission, we find a nearly dispersionless value of $1.3\pm0.3$ ns.
Finally, we examine the temperature dependence of emission characteristics. We
underline the impact of localized states in the wetting layer playing the role
of carrier reservoir during thermal carrier redistribution. We determine the
hole escape to the InAlGaAs barrier to be a primary PL quenching mechanism in
these QDs.

31
The categories of this paper are: ao-sci
10
The categories of this paper are: q-bio
6
The categories of this paper are: astro-ph
25
The categories of this paper are: patt-sol
23
The categories of this paper are: solv-int
24
The categories of this paper are: dg-ga
37
The categories of this paper are: supr-con
32
The categories of this paper are: atom-ph
5
The categories of this paper are: gr-qc
18
The categories of this paper are: econ
16
The categories of this paper are: stat
3
The categories of this paper are: physics
34
The categories of this paper are: chem-ph
30
The categories of this paper are: q-alg
22
The categories of this paper are: chao-dyn
0
The categories of this paper are: hep-ph