Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Modulation doping to control the high-density electron gas at a
  polar/non-polar oxide interface   A modulation-doping approach to control the carrier density of the
high-density electron gas at a prototype polar/non-polar oxide interface is
presented. It is shown that the carrier density of the electron gas at a
GdTiO3/SrTiO3 interface can be reduced by up to 20% from its maximum value (~
3x10^14 cm^-2) by alloying the GdTiO3 layer with Sr. The Seebeck coefficient of
the two-dimensional electron gas increases concurrently with the decrease in
its carrier density. The experimental results provide insight into the origin
of charge carriers at oxide interfaces exhibiting a polar discontinuity.

1
The categories of this paper are: cs
3
The categories of this paper are: physics
18
The categories of this paper are: econ
29
The categories of this paper are: funct-an
8
The categories of this paper are: hep-ex
20
The categories of this paper are: acc-phys
2
The categories of this paper are: math
0
The categories of this paper are: hep-ph
16
The categories of this paper are: stat
22
The categories of this paper are: chao-dyn
19
The categories of this paper are: eess
34
The categories of this paper are: chem-ph
30
The categories of this paper are: q-alg
26
The categories of this paper are: bayes-an
13
The categories of this paper are: quant-ph
17
The categories of this paper are: q-fin