Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Highly Tunable and Strong Bound Exciton in MoSi2N4 via Strain
  Engineering   Motivated by the recently synthesized layered material MoSi2N4, we
investigated excitonic response of quasiparticle of monolayer MoSi2N4 by using
G0W0 and Bethe-Salpeter equation (BSE) calculations. With a dually sandwiched
structure consisting of a central MoN2 layer analogue of 2H-MoS2 capped with
silicon-nitrogen (SiN) honeycomb outer layers, MoSi2N4 possesses frontier
orbitals confined at the central MoN2 layer with similar sub-valley at K-point
as 2H-MoS2. The valley splitting (~130 meV) due to the spin-orbital coupling
(SOC) gives rise to a doublet in the spectrum. Excitons in MoSi2N4 shows a
strong binding energy up to 0.95 eV with the optical bandgap of 2.44 eV. Both
electronic and optical gaps are highly sensitive to tensile strains and become
redshift albeit a marginal change of exciton binding energy. With the
protection of capped SiN layers, quantum confined excitons in MoSi2N4 without
the need of additional passivation layer like BN would provide a bright new
platform for robust emission with partially screened disturbance from
environment.

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The categories of this paper are: atom-ph
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The categories of this paper are: comp-gas
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The categories of this paper are: hep-ex
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The categories of this paper are: alg-geom
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The categories of this paper are: patt-sol
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The categories of this paper are: gr-qc
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The categories of this paper are: math
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The categories of this paper are: chao-dyn
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The categories of this paper are: econ
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The categories of this paper are: plasm-ph
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The categories of this paper are: mtrl-th
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The categories of this paper are: dg-ga
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The categories of this paper are: hep-lat
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The categories of this paper are: chem-ph
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The categories of this paper are: cmp-lg
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The categories of this paper are: adap-org