Terahertz-driven chiral phonons reveal angular momentum conservation in solids
A team of researchers from Helmholtz-Zentrum Dresden-Rossendorf (HZDR), the Fritz Haber Institute of the Max Planck Society, and additional collaborators in Berlin, Dresden, Jülich, and Eindhoven have experimentally demonstrated and coherently controlled the transfer of angular momentum between lattice vibrations, providing the first direct observation of how this conserved quantity propagates through a crystal lattice.
In solids, the exchange of energy and linear momentum between phonons via anharmonic coupling is well established. However, tracking angular momentum transfer between lattice modes has remained elusive, despite its central role in magnetization dynamics and spin relaxation phenomena such as the Einstein–de Haas effect. The present work closes this gap by directly resolving how quantized crystal angular momentum is redistributed between coupled vibrational modes.
Source: https://www.spintronics-info.com/terahertz-driven-chiral-phonons-reveal-angular-momentum-conservation-solids
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