Extended Data Fig. 7: rf response modulated by magnetic field.
From: Quantized radio-frequency rectification in a kagome superconductor Josephson diode
a and b, Mapping of \({V}_{{\rm{d.c.}}}\) as a function of \({I}_{{\rm{d.c.}}}\) and rf power with magnetic field of 2.5 mT (a) and -2.5 mT (b), respectively. The nonzero DC voltages emerge at specific rf powers without external current source, presenting quantized steps. c and d, The frequency-normalized \({\widetilde{V}}_{{\rm{d.c.}}}\) output exhibits oppositive (both fractional and integer) voltage steps at positive magnetic field (c) and negative magnetic field (d). e, The \({V}_{{\rm{d.c.}}}\) map as a function of \({I}_{{\rm{d.c.}}}\) and \({B}_{{\rm{z}}}\) is obtained at \(T=50\,{\rm{mK}}\) and \(f=2\,{\rm{GHz}}\), with a rf power of \(2.6\,{\rm{dBm}}\). The nonzero DC voltage can be observed along the zero current cut line (the gray dotted line), with the small magnetic fields applied. The polarity of output DC voltage is reversed when flipping the direction of magnetic field. f and g, Quantized rectification under magnetic fields. The DC voltage on/off switching can be realized by a rf power pulse of 6.7 dBm with an out of-plane magnetic field \({B}_{z}\) = -2.5 mT applied (f). When applying a magnetic field \({B}_{{\rm{z}}}\) = 2.5 mT in the opposite direction, the similar rectification can be achieved by a rf power pulse of 6.6 dBm, but the polarity of the rectification is reversed (g).
