Layer contribution to optical signals of van der Waals heterostructures

Abstract

The optical signals (such as Raman scattering, absorption, reflection) of van der Waals heterostructures (vdWHs) are very important for structure analysis and the application of optoelectronic devices. However, there is...

Configurable Phonon Polarization Responses in Twisted α-MoO3

“…It is different from the case of the BP homojunction where the I maximum of the homojunction is along the I maximum direction of the bottom layer BP. 54 More interestingly, as φ increases, the polar plots, as shown in Figure 3, change from a 2-fold pattern to a propeller-shaped one that exhibits a secondary maximum. The propeller-shaped pattern resembles the observations in ReX 2 (X = Se/S) 55,56 and in the superconductor Bi 2 Rh 3 Se 2 , 57 which have a lower crystal symmetry than α-MoO 3 .…”

“…For 30°-tBL α-MoO 3 , the polar plots display a similar two-folded pattern but with the I SVPM maxima not along the crystallographic [100] or [001] direction (0° or 90°) of top or bottom layer α-MoO 3 , as shown in Figure a,e. It is different from the case of the BP homojunction where the I maximum of the homojunction is along the I maximum direction of the bottom layer BP . More interestingly, as φ increases, the polar plots, as shown in Figure , change from a 2-fold pattern to a propeller-shaped one that exhibits a secondary maximum.…”