Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Structural Origin of Light Emission in Germanium Quantum Dots   The origin of visible light emission from nanostructures has been a subject
of an intense debate since the early work by L. E. Brus and A. P. Alivisatos in
1980s. The intense research that followed has paved the way towards
applications of quantum structures in optoelectronics and in bio-sensing and
contributed to the development of nanotechnology. The major new challenge is in
accessing the structural, electronic and optical properties of quantum dots on
a nanoparticle scale in order to understand complex relationships between
structural motifs and their contributions to the relevant physical (e. g.
optical and electronic) properties. Here we demonstrate that a combination of
molecular dynamics simulations and optically-detected x-ray absorption
spectroscopy shows sufficient sensitivity to distinguish between regions
contributing to the luminescence signal in oxygen and hydrogen terminated Ge
quantum dots, thus potentially providing a sub-nanoparticle resolution.

22
The categories of this paper are: chao-dyn
19
The categories of this paper are: eess
13
The categories of this paper are: quant-ph
11
The categories of this paper are: hep-lat
2
The categories of this paper are: math
37
The categories of this paper are: supr-con
12
The categories of this paper are: nucl-th
10
The categories of this paper are: q-bio
5
The categories of this paper are: gr-qc
33
The categories of this paper are: plasm-ph
7
The categories of this paper are: hep-th
9
The categories of this paper are: nlin
31
The categories of this paper are: ao-sci
3
The categories of this paper are: physics
25
The categories of this paper are: patt-sol
35
The categories of this paper are: mtrl-th