Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Band offset and negative compressibility in graphene-MoS2
  heterostructures   We use electron transport to characterize monolayer graphene - multilayer
MoS2 heterostructures. Our samples show ambipolar characteristics and
conductivity saturation on the electron branch which signals the onset of MoS2
conduction band population. Surprisingly, the carrier density in graphene
decreases with gate bias once MoS2 is populated, demonstrating negative
compressibility in MoS2. We are able to interpret our measurements
quantitatively by accounting for disorder and using the random phase
approximation (RPA) for the exchange and correlation energies of both Dirac and
parabolic-band two-dimensional electron gases. This interpretation allows us to
extract the energetic offset between the conduction band edge of MoS2 and the
Dirac point of graphene.

1
The categories of this paper are: cs
2
The categories of this paper are: math
26
The categories of this paper are: bayes-an
28
The categories of this paper are: alg-geom
27
The categories of this paper are: comp-gas
5
The categories of this paper are: gr-qc
30
The categories of this paper are: q-alg
16
The categories of this paper are: stat
14
The categories of this paper are: math-ph
22
The categories of this paper are: chao-dyn
25
The categories of this paper are: patt-sol
20
The categories of this paper are: acc-phys
37
The categories of this paper are: supr-con
11
The categories of this paper are: hep-lat
36
The categories of this paper are: cmp-lg
31
The categories of this paper are: ao-sci