Broadband Quantum Rectification and Mixing Via the Nonlinear Transport in PtTe2

The rapid growth of Internet of Things, 6G communication, and millimeter wave systems demands broadband rectifiers and mixers. The nonlinear Hall effect (NLHE) provides a junction-free route for broadband signal processing, overcoming high-frequency limitations associated with threshold voltages and junction capacitance in conventional semiconductor technologies. However, few NLHE material platforms combine strong nonlinearity, high conductivity, and compatibility with wafer-scale processing. In this work, we demonstrate NLHE in PtTe2 thin films with a second-order conductivity of 0.005 Ω-1 V-1 and a DC conductivity of 9.5 × 105 S/m at room temperature. The films enable bias-free rectification from 0.62 to 2.88 THz and frequency mixing from 0.1 to 40 GHz, including wireless mixing in the GHz regime. The passive mixer exhibits a 1 dB compression point of 8 dBm. These results establish PtTe2 as a wafer-scale platform for high-frequency signal processing, highlighting the practical potential of NLHE for next-generation communication and electronic technologies.