Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Experimental measurement of the intrinsic excitonic wavefunction   An exciton, a two-body composite quasiparticle formed of an electron and
hole, is a fundamental optical excitation in condensed-matter systems. Since
its discovery nearly a century ago, a measurement of the excitonic wavefunction
has remained beyond experimental reach. Here, we directly image the excitonic
wavefunction in reciprocal space by measuring the momentum distribution of
electrons photoemitted from excitons in monolayer WSe2. By transforming to real
space, we obtain a visual of the distribution of the electron around the hole
in an exciton. Further, by also resolving the energy coordinate, we confirm the
elusive theoretical prediction that the photoemitted electron exhibits an
inverted energy-momentum dispersion relationship reflecting the valence band
where the partner hole remains, rather than that of conduction-band states of
the electron.

8
The categories of this paper are: hep-ex
22
The categories of this paper are: chao-dyn
15
The categories of this paper are: nucl-ex
21
The categories of this paper are: adap-org
32
The categories of this paper are: atom-ph
26
The categories of this paper are: bayes-an
2
The categories of this paper are: math
14
The categories of this paper are: math-ph
0
The categories of this paper are: hep-ph
24
The categories of this paper are: dg-ga
1
The categories of this paper are: cs
25
The categories of this paper are: patt-sol
19
The categories of this paper are: eess
27
The categories of this paper are: comp-gas
31
The categories of this paper are: ao-sci
3
The categories of this paper are: physics