Quantum Rectification\nBased on Room Temperature Multidirectional\nNonlinearity in Bi<sub>2</sub>Te<sub>3</sub>

Recent interest in quantum nonlinearity has spurred the\ndevelopment\nof rectifiers for harvesting energy from ambient radiofrequency waves.\nHowever, these rectifiers face efficiency and bandwidth limitations\nat room temperature. We address these challenges by exploring Bi<sub>2</sub>Te<sub>3</sub>, a time-reversal symmetric topological quantum\nmaterial. Bi<sub>2</sub>Te<sub>3</sub> exhibits robust room temperature\nsecond-order voltage generation in both the longitudinal and transverse\ndirections. We harness these coexisting nonlinearities to design a\nmultidirectional quantum rectifier that can simultaneously extract\nenergy from various components of an input signal. We demonstrate\nthe efficacy of Bi<sub>2</sub>Te<sub>3</sub>-based rectifiers across\na broad frequency range, spanning from existing Wi-Fi bands (2.45\nGHz) to frequencies relevant to next-generation 5G technology (27.4\nGHz). Our Bi<sub>2</sub>Te<sub>3</sub>-based rectifier surpasses previous\nlimitations by achieving a high rectification efficiency and operational\nfrequency, alongside a low operational threshold and broadband functionality.\nThese findings enable practical topological quantum rectifiers for\nhigh-frequency electronics and energy conversion, advancing wireless\nenergy harvesting for next-generation communication.