Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: A semiconductor exciton memory cell based on a single quantum
  nanostructure   We demonstrate storage of excitons in a single nanostructure, a
self-assembled Quantum Post. After generation electron and holes forming the
exciton are separated by an electric field towards opposite ends of the Quantum
Post inhibiting their radiative recombination. After a defined time such
spatially indirect excitons are reconverted to optically active direct excitons
by switching the electric field. The emitted light of the stored exciton is
detected in the limit of a single nanostructure and storage times exceeding 30
msec are demonstrated. We identify a slow tunneling of the electron out of the
Quantum Post as the dominant loss mechanism by comparing the field dependent
temporal decay of the storage signal to models for this process and radiative
losses.

16
The categories of this paper are: stat
8
The categories of this paper are: hep-ex
20
The categories of this paper are: acc-phys
28
The categories of this paper are: alg-geom
22
The categories of this paper are: chao-dyn
17
The categories of this paper are: q-fin
10
The categories of this paper are: q-bio
6
The categories of this paper are: astro-ph
35
The categories of this paper are: mtrl-th
21
The categories of this paper are: adap-org
0
The categories of this paper are: hep-ph
24
The categories of this paper are: dg-ga
18
The categories of this paper are: econ
30
The categories of this paper are: q-alg
3
The categories of this paper are: physics
23
The categories of this paper are: solv-int