Max Planck Institute of Microstructure Physics

报告摘要:

Recently we have discovered a non-reciprocal Josephson diode effect in several Josephson junctions, both lateral and vertical, formed from conventional superconducting electrodes (Nb, NbSe2) separated by several non-superconducting metals including the 2D van der Waals metals, NiTe2 and WTe2, as well as sputtered layers of platinum that are magnetically proximitized via a magnetic insulator (YIG). The critical supercurrent densities for current flowing in opposite directions within the junction are distinct and can vary by up to 40% or more. For vertical Josephson junctions formed from WTe2 we show that the non-reciprocity depends on the orientation of the magnetic field with respect to the crystal structure of the WTe2, proving thereby the intrinsic origin of the Josephson diode effect. Such an effect could have important applications as a novel magnetic field detector at cryogenic temperatures, for example, to “read” magnetic domain walls in a cryogenic racetrack memory.

报告人简介：

Prof. Dr. Stuart Parkin is Director at the Max Planck Institute of Microstructure Physics, Halle, Germany, and an Alexander von Humboldt Professor at the Martin Luther University Halle-Wittenberg. For his work that thereby enabled the “big data” world of today, Parkin was awarded the Millennium Technology Award from the Technology Academy Finland in 2014 and, most recently the King Faisal Prize for Science 2021 for his research into three distinct classes of spintronic memories. Parkin is an elected Fellow/ Member: Royal Society (London), Royal Academy of Engineering, National Academy of Sciences, National Academy of Engineering, German National Academy of Science - Leopoldina, Royal Society of Edinburgh, Indian Academy of Sciences, and TWAS - academy of sciences for the developing world. Parkin has published >670 papers, has >123 issued patents, and has given >825 invited talks around the world. Parkin was named a “Highly Cited Researcher” by Clarivate for the years 2018-2022 and has an h-index of 129.

联系人：胡江平 研究员（8264 9818）

　　　　刘恩克 研究员（8264 9085）