The field-free Josephson diode in a van der Waals heterostructure.

Autor: Wu H; Max Planck Institute of Microstructure Physics, Halle, Germany. wuhenggcc@gmail.com.; College of Physics and Optoelectronic Engineering, Shenzhen University, Shenzhen, China. wuhenggcc@gmail.com.; Kavli Institute of Nanoscience, Delft University of Technology, Delft, The Netherlands. wuhenggcc@gmail.com., Wang Y; Max Planck Institute of Microstructure Physics, Halle, Germany.; Kavli Institute of Nanoscience, Delft University of Technology, Delft, The Netherlands., Xu Y; Max Planck Institute of Microstructure Physics, Halle, Germany.; Department of Physics, Princeton University, Princeton, NJ, USA., Sivakumar PK; Max Planck Institute of Microstructure Physics, Halle, Germany., Pasco C; Johns Hopkins University, Baltimore, MD, USA., Filippozzi U; Kavli Institute of Nanoscience, Delft University of Technology, Delft, The Netherlands., Parkin SSP; Max Planck Institute of Microstructure Physics, Halle, Germany., Zeng YJ; College of Physics and Optoelectronic Engineering, Shenzhen University, Shenzhen, China., McQueen T; Johns Hopkins University, Baltimore, MD, USA., Ali MN; Max Planck Institute of Microstructure Physics, Halle, Germany. m.n.ali@tudelft.nl.; Kavli Institute of Nanoscience, Delft University of Technology, Delft, The Netherlands. m.n.ali@tudelft.nl.
Jazyk: angličtina
Zdroj: Nature [Nature] 2022 Apr; Vol. 604 (7907), pp. 653-656. Date of Electronic Publication: 2022 Apr 27.
DOI: 10.1038/s41586-022-04504-8
Abstrakt: The superconducting analogue to the semiconducting diode, the Josephson diode, has long been sought with multiple avenues to realization being proposed by theorists 1-3 . Showing magnetic-field-free, single-directional superconductivity with Josephson coupling, it would serve as the building block for next-generation superconducting circuit technology. Here we realized the Josephson diode by fabricating an inversion symmetry breaking van der Waals heterostructure of NbSe 2 /Nb 3 Br 8 /NbSe 2 . We demonstrate that even without a magnetic field, the junction can be superconducting with a positive current while being resistive with a negative current. The ΔI c behaviour (the difference between positive and negative critical currents) with magnetic field is symmetric and Josephson coupling is proved through the Fraunhofer pattern. Also, stable half-wave rectification of a square-wave excitation was achieved with a very low switching current density, high rectification ratio and high robustness. This non-reciprocal behaviour strongly violates the known Josephson relations and opens the door to discover new mechanisms and physical phenomena through integration of quantum materials with Josephson junctions, and provides new avenues for superconducting quantum devices.
(© 2022. The Author(s), under exclusive licence to Springer Nature Limited.)
Databáze: MEDLINE
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