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 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 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 occurs due to a mismatch between superconducting d-wave order parameters, which suppresses the direct Cooper pair tunneling.
Twisted cuprate van der Waals heterostructures with controlled Josephson coupling / Martini, M; Lee, Y; Confalone, T; Shokri, S; Saggau, Cn; Wolf, D; G, Gu; Watanabe, K; Taniguchi, T; Montemurro, D; Vinokur VM., Nielsch K; Poccia, N. - In: MATERIALS TODAY. - ISSN 1369-7021. - 67:(2023), pp. 106-112. [https://doi.org/10.1016/j.mattod.2023.06.007]
Twisted cuprate van der Waals heterostructures with controlled Josephson coupling
Poccia N
2023
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 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 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 occurs due to a mismatch between superconducting d-wave order parameters, which suppresses the direct Cooper pair tunneling.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
