Twisted cuprate van der Waals heterostructures with controlled Josephson coupling

Research output: Contribution to journalResearch articleContributedpeer-review

Contributors

  • Mickey Martini - , Institute of Applied Physics, Leibniz Institute for Solid State and Materials Research Dresden, TUD Dresden University of Technology (Author)
  • Yejin Lee - , Institute of Applied Physics, Leibniz Institute for Solid State and Materials Research Dresden, TUD Dresden University of Technology (Author)
  • Tommaso Confalone - , Institute of Applied Physics, Leibniz Institute for Solid State and Materials Research Dresden, TUD Dresden University of Technology (Author)
  • Sanaz Shokri - , Institute of Applied Physics, Leibniz Institute for Solid State and Materials Research Dresden, TUD Dresden University of Technology (Author)
  • Christian N. Saggau - , Leibniz Institute for Solid State and Materials Research Dresden (Author)
  • Daniel Wolf - , Leibniz Institute for Solid State and Materials Research Dresden (Author)
  • Genda Gu - , Brookhaven National Laboratory (Author)
  • Kenji Watanabe - , National Institute for Materials Science Tsukuba (Author)
  • Takashi Taniguchi - , National Institute for Materials Science Tsukuba (Author)
  • Domenico Montemurro - , Universita' di Napoli Federico II (Author)
  • Valerii M. Vinokur - , Terra Quantum AG, City University of New York (Author)
  • Kornelius Nielsch - , Institute of Applied Physics, Leibniz Institute for Solid State and Materials Research Dresden, TUD Dresden University of Technology (Author)
  • Nicola Poccia - , Leibniz Institute for Solid State and Materials Research Dresden (Author)

Abstract

Twisted van der Waals (vdW) heterostructures offer a unique platform for engineering the efficient Josephson coupling between cuprate thin crystals harboring the nodal superconducting order parameter. Preparing the vdW heterostructures-based Josephson junction comprising stacked cuprates requires maintaining an ordered interface with preserved surface superconductivity. Here, we report the preparation of the Josephson junction out of the stacked Bi2Sr2CaCu2O8+d crystals using the cryogenic dry transfer technique and encapsulating the junction with an insulating layer, that protects the interface during the electrical contacts evaporation at the 1 × 10−6 mbar base pressure. We find that the Josephson critical current Ic has a maximum at low twist angles, comparable to that of the bulk intrinsic Josephson junctions, and is reduced by two orders of magnitude at twist angles close to 45°. The reduction of Ic occurs due to a mismatch between superconducting d-wave order parameters, which suppresses the direct Cooper pair tunneling.

Details

Original languageEnglish
Pages (from-to)106-112
Number of pages7
JournalMaterials today
Volume67
Publication statusPublished - 1 Jul 2023
Peer-reviewedYes

Keywords

Keywords

  • 2D materials, Josephson junctions, Twisted high temperature superconductors, Van der Waals heterostructures