Rectification of electromagnetic fields into direct current (DC) is pivotal for energy harvesting, wireless charging, and next-generation communication technologies. The superconducting diode effect, which exploits the nonreciprocal transport of dissipationless superconducting currents, offers ultra-low power consumption and high rectification ratios. Combining the superconducting diode effect with the AC Josephson effect holds promise for converting radio-frequency (rf) irradiation into a quantized DC output. However, experimental realization has been hindered by challenges in achieving the necessary symmetry breaking and fabricating high-performance Josephson junctions. Here we demonstrate the quantum rectification in kagome superconductor CsV3Sb5, which hosts emergent Josephson effects and a zero-field Josephson diode. Under rf irradiation, a DC voltage emerges without applied bias, scaling linearly with frequency as V = hf/2e, where h is Planck's constant, f is the microwave frequency, and e is the electron charge. Furthermore, the rectified voltage exhibits quantized steps with increasing rf power, consistent with Shapiro step quantization. Our work establishes CsV3Sb5 as a versatile platform for wireless quantum power supplies and charging, and underscores the intertwined order parameters as a promising pathway for precise quantum matter control.
Cite
@article{arxiv.2508.15266,
title = {Radio-Frequency Quantum Rectification in Kagome Superconductor CsV3Sb5},
author = {Han-Xin Lou and Jing-Jing Chen and Xing-Guo Ye and Zhen-Bing Tan and An-Qi Wang and Qing Yin and Xin Liao and Jing-Zhi Fang and Xing-Yu Liu and Yi-Lin He and Zhen-Tao Zhang and Chuan Li and Zhong-Ming Wei and Xiu-Mei Ma and Dapeng Yu and Zhi-Min Liao},
journal= {arXiv preprint arXiv:2508.15266},
year = {2025}
}