High-temperature Josephson diode

Abstract

Symmetry plays a critical role in determining various properties of a material. Semiconducting p-n junction diode exemplifies the engineered skew electronic response and is at the heart of contemporary electronic circuits. The non-reciprocal charge transport in a diode arises from doping-induced breaking of inversion symmetry. Breaking of time-reversal, in addition to inversion symmetry in some superconducting systems, leads to an analogous device - the superconducting diode. Following the pioneering first demonstration of the superconducting diode effect (SDE), a plethora of new systems showing similar effects have been reported. SDE lays the foundation for realizing ultra-low dissipative circuits, while Josephson phenomena-based diode effect (JDE) can enable realization of protected qubits. However, SDE and JDE reported thus far are at low temperatures ($\sim$ 4 K or lower) and impede their adaptation to technological applications. Here we demonstrate a Josephson diode working up to 77 K using an artificial Josephson junction (AJJ) of twisted layers of Bi${}_2$Sr${}_2$CaCu${}_2$O${}_{8+\delta }$ (BSCCO). The non-reciprocal response manifests as an asymmetry in the magnitude of switching currents and their distributions and appears for all twist angles. The asymmetry is induced by and tunable with a very small magnetic field applied perpendicular to the junction. We report a record asymmetry of 60 % at 20 K. We explain our results within a vortex-based scenario. Our results provide a path toward realizing superconducting quantum circuits at liquid nitrogen temperature.

46 pages, 25 figures

References in corpus (9)

• High-temperature topological superconductivity in twisted double layer copper oxides
• Diode effect in Josephson junctions with a single magnetic atom
• Non-reciprocity of Vortex-limited Critical Current in Conventional Superconducting Micro-bridges
• Diode effects in current-biased Josephson junctions
• Encapsulating high-temperature superconducting twisted van der Waals heterostructures blocks detrimental effects of disorder
• Twisted van der Waals Josephson junction based on high-Tc superconductor
• Persistent Josephson tunneling between Bi${}_2$Sr${}_2$CaCu${}_2$O${}_{8+x}$ flakes twisted by 45${}^{\circ }$ across the superconducting dome
• Spatial characterization of the edge barrier in wide superconducting films
• On-demand local modification of high-$T_{\text{c}}$ superconductivity in few unit-cell thick Bi${}_2$Sr${}_2$CaCu${}_2$O${}_{8+\delta }$

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