Scientists Observe Quantum Transfer of Angular Momentum in Crystal Lattice
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Researchers have directly observed how angular momentum moves between lattice vibrations in a crystal for the first time, using intense terahertz laser pulses. The experiment revealed an unexpected quantum effect where the direction of rotation reversed as momentum transferred. This discovery, published in Nature Physics, advances fundamental understanding of how energy and motion propagate at the atomic scale.
Facts First
- First direct observation of angular momentum transfer between lattice vibrations
- Unexpected reversal of rotation direction observed during transfer
- Experiment conducted using intense terahertz laser pulses on bismuth selenide
- Discovery attributed to rotational symmetry of the crystal lattice
- Collaboration included HZDR, Fritz Haber Institute, TU Dresden, Forschungszentrum Jülich, and Eindhoven University of Technology
What Happened
An international research team has directly observed how angular momentum moves through a crystal lattice for the first time. The experiment, led by scientists from the Helmholtz-Zentrum Dresden-Rossendorf (HZDR), the Fritz Haber Institute of the Max Planck Society, and collaborators in Berlin, Dresden, Jülich, and Eindhoven, utilized ultra-strong terahertz laser pulses to drive one lattice vibration into a circular motion. A second ultrafast laser pulse tracked how that motion interacted with another coupled vibration. During the experiment, researchers observed the direction of rotation flipping as angular momentum moved from one vibration to another in the material bismuth selenide.
Why this Matters to You
This discovery may deepen the fundamental understanding of how energy and motion propagate at the atomic scale in materials. Such advances could eventually inform the development of new materials with tailored thermal or electronic properties.
What's Next
The findings were published in the journal Nature Physics. This is the first experimental demonstration involving lattice angular momentum regarding an Umklapp-like process, a phenomenon where motion is effectively reversed due to crystal structure symmetry. Further research may explore this effect in other materials.