Topological phonons: Where vibrations find their twist

https://phys.org/news/2024-05-topological-phonons-vibrations.html

"predict opological phonon existence in approximately 5K materials... solid-state materials' nontrivial band topologies, leading to phonon surface states complementing/ enhancing electronic surface states... 50% of materials exhibit at least one non-trivial gap... facilitates strong surface electron-phonon coupling, potentially leading to surface superconductivity... frequency filtering, mechanical energy attenuation under imperfect conditions, heat transfer and IR photoelectronics, phonon diodes or acoustic waveguides"