Topic:
First-principles simulations and neutron scattering reveal conservation of hidden angular momenta for electrons and phonons in materials with structural twisting of coupled rotations and translations. Symmetry-derived global rules advance understanding of quasiparticle interactions and topologies toward discovery of materials with novel functionalities.
Rotational symmetries are built directly into electron and phonon dynamics derived from density functional theory and applied to a broad class of complex materials. New quantized angular momenta and rotational phase interference conditions are revealed. Structural twisting governs interactions, topologies, and band crossings that underlie material behaviors and how quasiparticles are seen in scattering experiments. DOI: 10.1016/j.mtphys.2021.100548
