Ultra-broadband wireless rectification and frequency mixing via the nonlinear Hall effect in TaIrTe₄

Driven by the advancements in the Internet of Things and emerging 6 G technologies, the demand for broadband energy harvesting and frequency conversion is surging. Traditional semiconductor devices face fundamental challenges at high frequencies, particularly in the terahertz range. Here, we demonstrate an ultra-broadband rectifier and a passive mixer based on the nonlinear Hall effect (NLHE) in a Weyl semimetal TaIrTe₄. The device achieves rectification across a broad range, from 19 MHz to 2.88 THz, at room temperature, operating without electrical bias or an external magnetic field. By employing series connections, we enhance the rectified voltage and accomplish polarization-insensitive operation. Furthermore, we realize a broadband (0.1-40 GHz) passive mixer with a conversion gain of - 20 dB and high linearity (IP_1dB = 4 dBm) based on NLHE in TaIrTe₄. These results establish NLHE in quantum materials as a powerful platform for next-generation high-frequency electronics.