Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Undoped accumulation-mode Si/SiGe quantum dots   We report on a quantum dot device design that combines the low disorder
properties of undoped SiGe heterostructure materials with an overlapping gate
stack in which each electrostatic gate has a dominant and unique function --
control of individual quantum dot occupancies and of lateral tunneling into and
between dots. Control of the tunneling rate between a dot and an electron bath
is demonstrated over more than nine orders of magnitude and independently
confirmed by direct measurement within the bandwidth of our amplifiers. The
inter-dot tunnel coupling at the (0,2)<-->(1,1) charge configuration
anti-crossing is directly measured to quantify the control of a single
inter-dot tunnel barrier gate. A simple exponential dependence is sufficient to
describe each of these tunneling processes as a function of the controlling
gate voltage.

16
The categories of this paper are: stat
22
The categories of this paper are: chao-dyn
2
The categories of this paper are: math
8
The categories of this paper are: hep-ex
34
The categories of this paper are: chem-ph
9
The categories of this paper are: nlin
36
The categories of this paper are: cmp-lg
15
The categories of this paper are: nucl-ex
35
The categories of this paper are: mtrl-th
10
The categories of this paper are: q-bio
18
The categories of this paper are: econ
19
The categories of this paper are: eess
23
The categories of this paper are: solv-int
6
The categories of this paper are: astro-ph
25
The categories of this paper are: patt-sol
24
The categories of this paper are: dg-ga