Scientists solve years-long mystery of 'beating' signal in a quantum material

A team of Korean researchers has become the first in the world to identify the origin of the "beating" signal that has long been a major obstacle to interpreting quantum signals in topological insulator (TI) nanowires. Their analysis confirmed that the beating arises when two different quantum oscillations overlap: one created by topological electronic states on the surface and the other by ordinary electronic states inside the nanowire. This achievement provides a key criterion for interpreting the signals of topological quantum devices and realizing desired electronic states.