Engineered Josephson Diode Effect in Kinked Rashba Nanochannels

The superconducting diode effect, reminiscent of the unidirectional chargetransport in semiconductor diodes, is characterized by a nonreciprocal,dissipationless flow of Cooper pairs. This remarkable phenomenon arises fromthe interplay between symmetry constraints and the inherent quantum behavior ofsuperconductors. Here, we explore the geometric control of the diode effect ina kinked nanostrip Josephson junction based on a two-dimensional electron gas(2DEGs) with Rashba spin-orbit interaction. We provide a comprehensive analysisof the diode effect as a function of the kink angle and the out-of-planemagnetic field. Our analysis reveals a rich phase diagram, showcasing ageometry and field-controlled diode effect. The phase diagram also reveals thepresence of an anomalous Josephson effect related to the emergence of trivialzero-energy Andreev bound states, which can evolve into Majorana bound states.Our findings indicate that the exceptional synergy between geometric control ofthe diode effect and topological phases can be effectively leveraged to designand optimize superconducting devices with tailored transport properties.