Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: A Schottky top-gated two-dimensional electron system in a nuclear spin
  free Si/SiGe heterostructure   We report on the realization and top-gating of a two-dimensional electron
system in a nuclear spin free environment using 28Si and 70Ge source material
in molecular beam epitaxy. Electron spin decoherence is expected to be
minimized in nuclear spin-free materials, making them promising hosts for
solid-state based quantum information processing devices. The two-dimensional
electron system exhibits a mobility of 18000 cm2/Vs at a sheet carrier density
of 4.6E11 cm-2 at low temperatures. Feasibility of reliable gating is
demonstrated by transport through split-gate structures realized with palladium
Schottky top-gates which effectively control the two-dimensional electron
system underneath. Our work forms the basis for the realization of an
electrostatically defined quantum dot in a nuclear spin free environment.

37
The categories of this paper are: supr-con
12
The categories of this paper are: nucl-th
0
The categories of this paper are: hep-ph
30
The categories of this paper are: q-alg
36
The categories of this paper are: cmp-lg
5
The categories of this paper are: gr-qc
16
The categories of this paper are: stat
28
The categories of this paper are: alg-geom
6
The categories of this paper are: astro-ph
11
The categories of this paper are: hep-lat
15
The categories of this paper are: nucl-ex
23
The categories of this paper are: solv-int
10
The categories of this paper are: q-bio
26
The categories of this paper are: bayes-an
21
The categories of this paper are: adap-org
31
The categories of this paper are: ao-sci