Monolayer transition metal dichalcogenides exhibit strong internal bonding, but when stacked, weak interlayer van der Waals forces impact their mechanical properties and vibrations.
This study investigates how the twist angle between WS bilayers affects the frequency of interlayer phonons and their coupling, using Raman spectroscopy to identify variations based on angle.
Findings include the discovery of new interlayer modes and the influence of twist angle on exciton and trion behavior, suggesting significance for future optoelectronic devices and twistronics research.