Linear and nonlinear optical response based on many-body GW-Bethe–Salpeter and Kadanoff–Baym approaches for two-dimensional layered semiconductors

Key Points

• The study reveals significant differences in optical response using many-body theoretical approaches, especially for layered semiconductors.
• Key evidence shows variations in linear and nonlinear responses based on GW-Bethe–Salpeter versus Kadanoff-Baym methods.
• Assessment using advanced many-body techniques provides insights into quantum behavior in two-dimensional materials.
• These findings highlight the potential for developing new photonic devices based on layered semiconductor properties.