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Abstract
<p class="first" id="d8831556e85">On the basis of electron-electron self-energy corrections,
quasiparticle band structures
of Janus MoSSe and WSSe are identified, and the excitonic effects are demonstrated
to play a dominate role in the optical response. Combining together MoSSe and WSSe
monolayers to form vertical heterostructures (VHTs) and lateral heterostructures (LHTs)
rarely leads to a simple arithmetic sum of their properties, giving rise to novel
and unexpected behaviors. In particular, Rashba polarization can be enhanced in VHTs
due to improved out-of-plane electric polarity. In the case of LHTs, photoresponse
and absorption coefficients show optical activity in a wide visible light range. It
is of interest that both VHTs and LHTs reveal type-II band alignment, enabling the
separation of excitons. Besides, grain boundaries (GBs) of large angle (60°) in Janus
MoSSe due to chalcogen effects behave as one-dimensional (1D) metallic quantum wires,
suggesting the possible formation of 1D electron or hole gas in such electronic heterostructures.
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