Truly chiral phonons—i.e., rotating and propagating atomic motions seen in a crystal lattice—have never been observed in a bulk 3D material. However, now, Tokyo Tech researchers have ...

"Recently, there has been growing interest in the magnetic moment carried by phonon modes that show circular motion, also known as chiral phonons. But the mechanisms that can lead to a large ...

Topological phonons could also pave the way for creating phonon diodes or acoustic waveguides," explained Nicolas Regnault, a ...