In a recent study, researchers at the University of California, Berkeley have shown that corkscrew elastic waves carry well-defined orbital angular momentum (OAM). This finding could have important implications for a variety of fields, including optics, acoustics, and telecommunications.

OAM is a type of angular momentum that is associated with the rotation of an object around an axis. In optics, OAM is carried by light waves that have a helical shape. These waves can be generated by passing light through a spiral phase plate or by using a laser with a spiral-shaped beam.

In acoustics, OAM is carried by sound waves that have a corkscrew shape. These waves can be generated by vibrating a surface in a spiral pattern or by using a loudspeaker with a spiral-shaped diaphragm.

The researchers at Berkeley used a laser to generate corkscrew elastic waves in a solid material. They then used a microscope to measure the OAM of the waves. They found that the waves carried a well-defined OAM, which was equal to the number of rotations of the corkscrew shape per wavelength.

This finding is important because it shows that corkscrew elastic waves can be used to carry information in a way that is not possible with traditional waves. This could have a variety of applications, such as in telecommunications and data storage.

In addition, the researchers' findings could also lead to new insights into the fundamental properties of matter. For example, the fact that corkscrew elastic waves can carry OAM suggests that the material through which they travel must have a certain amount of elasticity and anisotropy. This information could be used to better understand the structure and properties of materials.

The researchers' findings are published in the journal Nature Physics.