| Summary: | The nonreciprocal Josephson junction, the Josephson diode, opens a door for superconducting circuit technology. Here, we report on nonreciprocal behaviors in Nb/Au/NbSe2 Josephson junctions. The strong asymmetry could be seen in the current-voltage characteristics, which most likely arises from time symmetry breaking due to Abrikosov vortices, indicated by an asymmetric Fraunhofer pattern. The nonreciprocal microwave responses are systematically investigated compared to a numerical simulation based on a resistively and capacitively shunted junction model, which could well capture the asymmetric behaviors and rule out some artifacts such as other parasitic Josephson-like structures. Based on the nonreciprocal microwave responses, we put forward a proposal for a switchable Josephson diode controlled by an external microwave, which might provide an opportunity for next-generation microwave-related superconducting circuits.
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