First topological acoustic transistor sound waves may pave the way for topological electronic transistors

https://www.seas.harvard.edu/news/2022/01/first-topological-acoustic-transistor

"Topological materials move electrons along their surface and edges without any loss, making them promising materials for dissipationless, high-efficiency electronics... with sound waves instead of electrons — and proposed a connection architecture to form a universal logic gate that can switch the flow of sound on and off... honeycomb lattice that can be rapidly expanded using SMA coils to create a high thermal expansion coefficient"

Related: Inspired by the human ear, a new acoustic fabric converts audible sounds into electrical signals

https://techxplore.com/news/2022-03-human-ear-acoustic-fabric-audible.html