Chongfan Technology
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18
2026
-
05
Observation of Angular Momentum Transfer Between Lattice Modes
Author:
The team of Sebastian F. Maehrlein at the Fritz-Haber-Institut has demonstrated and coherently controlled angular-momentum transfer between two lattice modes by exploiting the reverse process of anharmonic decay. The observed rotational phonon–phonon Umklapp scattering ensures the quantized conservation of crystalline angular momentum, as dictated by the crystal’s discrete rotational symmetry. In this way, the authors experimentally confirm the fundamental similarity between linear-momentum conservation and angular-momentum conservation in solids. Furthermore, they show that axial nonlinear phononics represents a promising approach for ultrafast control of material properties.
The research findings were published in Nature Physics on May 12, 2026, under the title “Observation of angular momentum transfer among crystal lattice modes.”
Figure 1: Phonon–phonon angular momentum transfer in bismuth selenide.
Figure 2: Terahertz field and phonon trajectories, along with their helicity states.
Figure 3: Angular Momentum Transfer Channels and Dynamics
Figure 4: Conservation of Phonon Angular Momentum
Source: Optics World
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