Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Observation of large many-body Coulomb interaction effects in a doped
  quantum wire   We demonstrate strong one dimensional (1-D) many-body interaction effects in
photoluminescence (PL) in a GaAs single quantum wire of unprecedented optical
quality, where 1-D electron plasma densities are controlled via electrical
gating. We observed PL of 1-D charged excitons with large binding energy of 2.3
meV relative to the neutral excitons, and its evolution to a Fermi-edge
singularity at high electron density. Furthermore, we find a strong band-gap
renormalization in the 1-D wire, or a large red-shift of PL with increased
electron plasma density. Such a large PL red-shift is not observed when we
create a high density neutral electron-hole plasma in the same wire, due
probably to cancellation of the Coulomb interaction energy in the neutral
plasma.

13
The categories of this paper are: quant-ph
29
The categories of this paper are: funct-an
11
The categories of this paper are: hep-lat
12
The categories of this paper are: nucl-th
25
The categories of this paper are: patt-sol
17
The categories of this paper are: q-fin
21
The categories of this paper are: adap-org
33
The categories of this paper are: plasm-ph
3
The categories of this paper are: physics
14
The categories of this paper are: math-ph
8
The categories of this paper are: hep-ex
5
The categories of this paper are: gr-qc
2
The categories of this paper are: math
30
The categories of this paper are: q-alg
37
The categories of this paper are: supr-con
31
The categories of this paper are: ao-sci