Quasiparticle band alignment and stacking-independent exciton in MA2Z4 (M = Mo, W, Ti; A= Si, Ge; Z = N, P, As)
Abstract
Motivated by the recently synthesized two-dimensional semiconducting MoSi2N4, we systematically investigate the quasiparticle band alignment and exciton in monolayer MA2Z4 (M = Mo, W, Ti; A= Si, Ge; Z = N, P, As) using ab initio GW and Bethe-Salpeter equation calculations. Compared with the results from density functional theory (DFT), our GW calculations reveal substantially more significant band gaps and different absolute quasiparticle energy but predict the same types of band alignments.
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