Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Two-dimensional MoS$_2$ electromechanical actuators   We investigate electromechanical properties of two-dimensional MoS$_2$
monolayers in the 1H, 1T, and 1T$^\prime$ structures as a function of charge
doping by using density functional theory. We find isotropic elastic moduli in
the 1H and 1T structures, while the 1T$^\prime$ structure exhibits an
anisotropic elastic modulus. Moreover, the 1T structure is shown to have a
negative Poisson's ratio, while Poisson's ratios of the 1H and 1T$^\prime$ are
positive. By charge doping, the monolayer MoS$_2$ shows a reversibly strain and
work density per cycle ranging from -0.68% to 2.67% and from 4.4 to 36.9
MJ/m$^3$, respectively, making them suitable for applications in
electromechanical actuators. Stress generated is also examined in this work and
we find that 1T and 1T$^\prime$ MoS$_2$ monolayers relatively have better
performance than 1H MoS$_2$ monolayer. We argue that such excellent
electromechanical performance originate from the electrical conductivity of the
metallic 1T and semimetallic 1T$^\prime$ structures high Young's modulus of
about $150-200$ GPa.

7
The categories of this paper are: hep-th
26
The categories of this paper are: bayes-an
14
The categories of this paper are: math-ph
30
The categories of this paper are: q-alg
36
The categories of this paper are: cmp-lg
6
The categories of this paper are: astro-ph
25
The categories of this paper are: patt-sol
22
The categories of this paper are: chao-dyn
8
The categories of this paper are: hep-ex
0
The categories of this paper are: hep-ph
5
The categories of this paper are: gr-qc
20
The categories of this paper are: acc-phys
34
The categories of this paper are: chem-ph
9
The categories of this paper are: nlin
16
The categories of this paper are: stat
29
The categories of this paper are: funct-an