Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Imaging electron flow and quantum dot formation in MoS2 nanostructures   Among newly discovered two-dimensional (2D) materials, semiconducting
ultrathin sheets of MoS2 show potential for nanoelectronics. However, the
carrier mobility in MoS2 is limited by scattering from surface impurities and
the substrate. To probe the sources of scattering, we use a cooled scanning
probe microscope (SPM) to image the flow of electrons in a MoS2 Hall bar sample
at 4.2 K. Capacitive coupling to the SPM tip changes the electron density below
and scatters electrons flowing nearby; an image of flow can be obtained by
measuring the change in resistance between two contacts as the tip is raster
scanned across the sample. We present images of current flow through a large
contact that decay exponentially away from the sample edge. In addition, the
images show the characteristic "bullseye" pattern of Coulomb blockade
conductance rings around a quantum dot as the density is depleted with a back
gate. We estimate the size and position of these quantum dots using a
capacitive model.

13
The categories of this paper are: quant-ph
32
The categories of this paper are: atom-ph
26
The categories of this paper are: bayes-an
10
The categories of this paper are: q-bio
35
The categories of this paper are: mtrl-th
34
The categories of this paper are: chem-ph
7
The categories of this paper are: hep-th
22
The categories of this paper are: chao-dyn
19
The categories of this paper are: eess
6
The categories of this paper are: astro-ph
14
The categories of this paper are: math-ph
37
The categories of this paper are: supr-con
16
The categories of this paper are: stat
21
The categories of this paper are: adap-org
20
The categories of this paper are: acc-phys
17
The categories of this paper are: q-fin