Ultrabroadband energy harvesting with nonlinear Hall effect in a magnetic Weyl semimetal

Widespread wireless communication generates abundant ambient electromagnetic waves, creating opportunities for energy harvesting. Converting this energy into direct current requires an efficient rectifier, yet conventional Schottky diodes suffer from low efficiency at low power and operate over a limited frequency range. The nonlinear Hall effect (NLHE) in topological materials enables junctionless rectifiers capable of operating into the terahertz (THz) range, providing a pathway to overcome these limitations. Here, we demonstrate a room-temperature, broadband NLHE rectifier that enables energy harvesting across a flat frequency response from 100 Hz to 20 GHz. Integration with peripheral circuitry confirms its ability to harvest energy in free space. This platform could open opportunities for developing autonomously powered Internet of Things devices and advancing applications in wireless communication.