  The multi-scale computational method of combining first-principles
calculation and finite element electromagnetic simulations is used to study
plasmon-enhanced interlayer charge transfer (ICT) exciton of 2D lateral and van
der Waals MoS2/WS2 heterostructure with 2H phase. The weak ICT excitons are
observed in the 2H lateral and van der Waals MoS$_2$/WS$_2$ heterostructures.
Theoretical results reveal the physical principle of plexciton resulting from
strong coupling between plasmonic and ICT exciton. The weak CT exciton can be
strongly enhanced by metal plasmon, can provide a new way to observe the weak
CT exciton. Our results can promote deeper understanding of the plexciton
resulting from strong coupling interaction between plasmon and exciton of
lateral and van der Waals heterostructures.
