Skip to main content
U.S. Department of Energy
Office of Scientific and Technical Information

Preserving the Josephson Coupling of Twisted Cuprate Junctions via Tailored Silicon Nitride Circuits Boards

Journal Article · · Small
 [1];  [1];  [2];  [2];  [3];  [4];  [2];  [1];  [5];  [6]
  1. Leibniz Inst. for Solid State and Materials Research (IFW), Dresden (Germany); Technische Universität Dresden (Germany)
  2. Univ. of Naples Federico II (Italy)
  3. Terra Quantum AG, St. Gallen (Switzerland)
  4. Brookhaven National Laboratory (BNL), Upton, NY (United States)
  5. Leibniz Inst. for Solid State and Materials Research (IFW), Dresden (Germany)
  6. Leibniz Inst. for Solid State and Materials Research (IFW), Dresden (Germany); Univ. of Naples Federico II (Italy)
Controlled fabrication of twisted van der Waals heterostructures is essential to unlock the full potential of moiré materials. However, achieving reproducibility remains a major challenge, particularly for air-sensitive materials such as Bi2Sr2CaCu2O8 + δ (BSCCO), where it is crucial to preserve the intrinsic and delicate superconducting properties of the interface throughout the entire fabrication process. Here, a dry, inert and cryogenic assembly method is presented that combines silicon nitride nanomembranes (NMBs) with pre-patterned electrodes and the cryogenic stacking technique (CST) to fabricate high-quality twisted BSCCO Josephson junctions (JJs). This protocol prevents thermal and chemical degradation during both interface formation and electrical contact integration. It is also found that asymmetric membrane designs, such as a double cantilever, effectively suppress vibration-induced disorder due to wire bonding, resulting in sharp and hysteretic current–voltage characteristics. The junctions exhibit a twist-angle-dependent Josephson coupling with magnitudes comparable to the highest-performing devices reported to date, but achieved through a straightforward and versatile contact method, offering a scalable and adaptable platform for future applications. These findings highlight the importance of both interface and contact engineering in addressing reproducibility in superconducting van der Waals heterostructures.
Research Organization:
Brookhaven National Laboratory (BNL), Upton, NY (United States)
Sponsoring Organization:
European Research Council (ERC); German Research Foundation (DFG); USDOE Office of Science (SC), Basic Energy Sciences (BES)
Grant/Contract Number:
SC0012704
OSTI ID:
3005232
Report Number(s):
BNL--229175-2025-JAAM
Journal Information:
Small, Journal Name: Small Journal Issue: 50 Vol. 21; ISSN 1613-6810; ISSN 1613-6829
Publisher:
WileyCopyright Statement
Country of Publication:
United States
Language:
English

References (47)

Physics and Applications of the Josephson Effect book July 1982
Proximity‐Induced Unconventional Superconducting Quantum Oscillation in WTe2/NbSe2 Heterostructures journal October 2024
Encapsulating High‐Temperature Superconducting Twisted van der Waals Heterostructures Blocks Detrimental Effects of Disorder journal January 2023
Electrical Contacts With 2D Materials: Current Developments and Future Prospects journal January 2023
Fundamentals and Frontiers of the Josephson Effect book December 2018
Large Bi-2212 single crystal growth by the floating-zone technique journal April 2008
Twisted cuprate van der Waals heterostructures with controlled Josephson coupling journal July 2023
Challenges and Opportunities in 2D Materials journal November 2024
Unveiling the Degradation Mechanism of High-Temperature Superconductor Bi2Sr2CaCu2O8+δ in Water-Bearing Environments journal August 2022
2D High-Temperature Superconductor Integration in Contact Printed Circuit Boards journal October 2023
Moiré Patterns in 2D Materials: A Review journal March 2021
Inducing Strong Superconductivity in WTe 2 by a Proximity Effect journal June 2018
Scale-free structural organization of oxygen interstitials in La2CuO4+y journal August 2010
Inhomogeneity of charge-density-wave order and quenched disorder in a high-Tc superconductor journal September 2015
Evolution and control of oxygen order in a cuprate superconductor journal August 2011
Autonomous robotic searching and assembly of two-dimensional crystals to build van der Waals superlattices journal April 2018
Prominent Josephson tunneling between twisted single copper oxide planes of Bi2Sr2-xLaxCuO6+y journal August 2023
High-temperature Josephson diode journal February 2024
Semiconductor moiré materials journal July 2022
High-temperature superconductivity in monolayer Bi2Sr2CaCu2O8+δ journal October 2019
Reproducibility in the fabrication and physics of moiré materials journal February 2022
Pick-up and assembling of chemically sensitive van der Waals heterostructures using dry cryogenic exfoliation journal May 2024
Clean assembly of van der Waals heterostructures using silicon nitride membranes journal December 2023
Van der Waals heterostructures journal July 2022
Challenges in the electrical engineering of cuprate twistronics journal January 2025
Hall effect in the MnBi2Te4 crystal using silicon nitride nanomembrane via contacts journal November 2023
Two-dimensional atomic crystals journal July 2005
Persistent Josephson tunneling between Bi2Sr2CaCu2O8+x flakes twisted by 45∘ across the superconducting dome journal November 2023
Inhomogeneity-induced time-reversal symmetry breaking in cuprate twist junctions journal September 2023
Josephson effects in twisted nodal superconductors journal January 2025
Orientational anisotropy of the upper critical field in single-crystal Y Ba 2 Cu 3 O 7 and Bi 2.2 Ca Sr 1.9 Cu 2 O 8 + x journal November 1988
Current-voltage characteristics of intrinsicBi2Sr2CaCu2O8Josephson-junction stacks and an unconventional temperature dependence of the magnitude of the order parameter journal May 1997
Theory of Josephson effects in anisotropic superconductors journal July 1997
Tunneling spectroscopy with intrinsic Josephson junctions inBi2Sr2CaCu2O8+δandTl2Ba2Ca2Cu3O10+δ journal June 1998
Angular dependence of the Josephson critical current in c -axis twist junctions of high-temperature superconductors journal July 1998
Suppressed superconductivity of the surface conduction layer in Bi 2 Sr 2 CaCu 2 O 8 + x single crystals probed by c -axis tunneling measurements journal June 1999
Critical currents of small Bi2Sr2CaCu2O8+x intrinsic Josephson junction stacks in external magnetic fields journal September 2000
Models of c -axis twist Josephson tunneling journal October 2001
c -axis transport in naturally grown Bi 2 Sr 2 CaCu 2 O 8 + δ cross-whisker junctions journal September 2004
Relevant energy scale in hybrid mesoscopic Josephson junctions journal August 2008
Stability of exfoliated Bi 2 Sr 2 Dy x Ca 1 − x Cu 2 O 8 + δ studied by Raman microscopy journal August 2010
Origin of the insulating state in exfoliated high- T c two-dimensional atomic crystals journal August 2014
Sign-Reversing Hall Effect in Atomically Thin High-Temperature Bi 2.1 Sr 1.9 CaCu 2.0 O 8 + δ Superconductors journal June 2019
Intrinsic Josephson effects in Bi 2 Sr 2 CaCu 2 O 8 single crystals journal April 1992
Subgap Structures in Intrinsic Josephson Junctions ofTl2Ba2Ca2Cu3O10+δandBi2Sr2CaCu2O8+δ journal June 1996
Bi 2 Sr 2 CaCu 2 O 8 + δ Bicrystal c -Axis Twist Josephson Junctions: A New Phase-Sensitive Test of Order Parameter Symmetry journal November 1999
Time-reversal symmetry breaking superconductivity between twisted cuprate superconductors journal December 2023