Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Excitons versus electron-hole plasma in monolayer transition metal
  dichalcogenide semiconductors   When electron-hole pairs are excited in a semiconductor, it is a priori not
clear if they form a fermionic plasma of unbound particles or a bosonic exciton
gas. Usually, the exciton phase is associated with low temperatures. In
atomically thin transition metal dichalcogenide semiconductors, excitons are
particularly important even at room temperature due to strong Coulomb
interaction and a large exciton density of states. Using state-of-the-art
many-body theory including dynamical screening, we show that the
exciton-to-plasma ratio can be efficiently tuned by dielectric substrate
screening as well as charge carrier doping. Moreover, we predict a Mott
transition from the exciton-dominated regime to a fully ionized electron-hole
plasma at excitation densities between $3\times10^{12}$ cm$^{-2}$ and
$1\times10^{13}$ cm$^{-2}$ depending on temperature, carrier doping and
dielectric environment. We propose the observation of these effects by studying
excitonic satellites in photoemission spectroscopy and scanning tunneling
microscopy.

25
The categories of this paper are: patt-sol
37
The categories of this paper are: supr-con
19
The categories of this paper are: eess
15
The categories of this paper are: nucl-ex
26
The categories of this paper are: bayes-an
0
The categories of this paper are: hep-ph
7
The categories of this paper are: hep-th
29
The categories of this paper are: funct-an
10
The categories of this paper are: q-bio
21
The categories of this paper are: adap-org
31
The categories of this paper are: ao-sci
36
The categories of this paper are: cmp-lg
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The categories of this paper are: q-fin
14
The categories of this paper are: math-ph
23
The categories of this paper are: solv-int
32
The categories of this paper are: atom-ph