単層MoS₂・MoSe₂・WS₂・WSe₂のラマン特性：E₂g¹とA₁gピーク逆転の物理

Explaining the interchange of in-plane E₂g¹ and out-of-plane A₁g Raman peaks across monolayer MoS₂, MoSe₂, WS₂, and WSe₂.

Abstract: Monolayer transition-metal dichalcogenides (TMDs) MoS₂, MoSe₂, WS₂, and WSe₂ exhibit prominent in-plane (E₂g¹) and out-of-plane (A₁g) Raman modes. Uniquely, MoSe₂ shows an inversion where the E₂g¹ peak exceeds the A₁g peak in frequency. This article explains the physical origin of E₂g¹ and A₁g modes, how their relative positions differ across …