ENG: A research team from the University of Geneva reports experimental evidence for a “hidden” geometry inside certain quantum materials. The idea is called the quantum metric and it describes how the quantum states available to electrons are arranged and “curved” in an abstract space. Even though this space is not ordinary physical space, its curvature can still affect what happens in the lab, because electrons follow paths that depend on the structure of their quantum states. In simple terms, if that quantum space is curved, electron motion can be subtly redirected, somewhat like how gravity changes the path of light. For about two decades the quantum metric was mostly treated as a theoretical concept, because it was difficult to isolate a clear experimental signature of its effects.
