Twisted cuprate van der Waals heterostructures with controlled Josephson coupling
Research output: Contribution to journal › Research article › Contributed › peer-review
Contributors
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 language | English |
|---|---|
| Pages (from-to) | 106-112 |
| Number of pages | 7 |
| Journal | Materials today |
| Volume | 67 |
| Publication status | Published - 1 Jul 2023 |
| Peer-reviewed | Yes |
Keywords
ASJC Scopus subject areas
Keywords
- 2D materials, Josephson junctions, Twisted high temperature superconductors, Van der Waals heterostructures