Fig. 21
From: Recent advances in chiral nanomaterials with unique electric and magnetic properties
a The helicity-resolved photoluminescence of monolayer MoS2 at 80 K with excitation photon energy at 2.54 eV (upper) and 1.92 eV (lower). b The helicity-resolved Raman spectra (488 nm with σ + polarization) of MoS2 from monolayer to bulk. Inset: normalized angular dependence of the Rayleigh (green), IMC (blue), and OC phonon (orange) scattering intensities for monolayer MoS2. c Raman scattering with various excitation intensities. Reproduced with permission from [133]. d Phonon dispersion relation of a honeycomb AB lattice. The radii of circles denote vibration amplitudes; phase and rotation direction are included. e Phase correlation of the nonlocal phonon part for sublattice A (upper two panels) and sublattice B (lower two panels). Reproduced with permission from [128]. f PAM for bands 1 to 4 at valleys K’ and K. g Diagram of indirect optical transition for the LCP and RCP IR photons. h The measured CD in time-domain at 82 K. Reproduced with permission from [127]