Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Capacitive coupling in hybrid Graphene-GaAs nanostructures   Coupled hybrid nanostructures are demonstrated using the combination of
lithographically patterned graphene on top of a two-dimensional electron gas
(2DEG) buried in a GaAs/AlGaAs heterostructure. The graphene forms Schottky
barriers at the surface of the heterostructure and therefore allows tuning the
electronic density of the 2DEG. Conversely, the 2DEG potential can tune the
graphene Fermi energy. Graphene-defined quantum point contacts in the 2DEG show
half-plateaus of quantized conductance in finite bias spectroscopy and display
the 0.7 anomaly for a large range of densities in the constriction, testifying
to their good electronic properties. Finally, we demonstrate that the GaAs
nanostructure can detect charges in the vicinity of the heterostructure's
surface. This confirms the strong coupling of the hybrid device: localized
states in the graphene ribbon could in principle be probed by the underlying
confined channel. The present hybrid graphene/GaAs nanostructures are promising
for the investigation of strong interactions and coherent coupling between the
two fundamentally different materials.

9
The categories of this paper are: nlin
32
The categories of this paper are: atom-ph
35
The categories of this paper are: mtrl-th
16
The categories of this paper are: stat
2
The categories of this paper are: math
6
The categories of this paper are: astro-ph
34
The categories of this paper are: chem-ph
13
The categories of this paper are: quant-ph
11
The categories of this paper are: hep-lat
0
The categories of this paper are: hep-ph
27
The categories of this paper are: comp-gas
33
The categories of this paper are: plasm-ph
23
The categories of this paper are: solv-int
26
The categories of this paper are: bayes-an
15
The categories of this paper are: nucl-ex
7
The categories of this paper are: hep-th