An international team of researchers, including scientists from the Helmholtz-Zentrum Dresden-Rossendorf (HZDR) and the Fritz Haber Institute of the Max Planck Society, has directly observed for the first time how angular momentum moves and remains conserved inside a crystal lattice. By using powerful terahertz laser pulses, the team was able to precisely manipulate these motions and discovered an unexpected effect: during the transfer process, the direction of rotation flips because of the material’s rotational symmetry.
The study, published in Nature Physics, offers new insight into the origins of magnetism and could help researchers develop more precise ways to control quantum materials.
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