In two-dimensional crystals, electrons and holes (empty spots with a positive charge) attract each other, forming pairs called excitons. Under extreme cooling, their motions can synchronize like a dance, giving rise to a Bose-Einstein condensate — a unified quantum wave. Long-range electric attraction twists this wave into a vortex with two Weyl points, where the flow seems to pour in and out.
Such a structure produces edge currents without resistance — perfect conductors. This brings the material closer to hypothetical particles from the Standard Model. To confirm, precise surface spectroscopy is needed, but success promises ultra-sensitive sensors and quantum processors.
An exciton pair condensate transfers energy without loss, like a frictionless fluid, but for neutral composite particles.
In science fiction, exotic matter is endowed with incredible properties — vortex condensate seems to bring these fantasies to life.