Valley-optical absorption in planar transition metal dichalcogenide superlattices

TMDC-PSL Hamiltonian

In our model, we consider the TMDC-PSL as shown in Fig. 1, which is formed by alternatively arranged \({MoS}_{2}/{WSe}_{2}\) in a plane labeled as A and B. This model is evidenced by the experiments for demonstration of 2D lateral multiheterojunctions and superlattices by growth of sub–2-nm quantum-well arrays in semiconductor monolayers, driven by the climb of misfit dislocations in a lattice-mismatched sulfide/selenide heterointerface¹³. We start with the ML-TMDCs Hamiltonian to obtain the band structure and transmission spectrum of TMDC-PSL^22,23 as: