High-Tc superconducting Josephson junctions circuits

The PHASME team has developed a technique to structure High-Temperature Superconducting thin films at the nanoscale combining advanced electronic lithography with ion irradiation. In particular, we have been able to fabricate high-temperature YBa2Cu3O7 Josephson junctions which are the building blocks at the heart of many different superconducting circuits. The natural scalability of this technique makes it particularly suitable to implement complex circuits that include a large number of junctions. We took advantage of this technique to realize large scale SQUIDs and SQIFs arrays, whose properties such that the temperature of operation and the sensitivity, can be controlled by the irradiation parameters (energy, fluency). More recently, we have developed heterodyne Josephson mixers for the THz range of frequency which is a frontier area for research in many fields, including physics, astronomy, chemistry, material science, biology and medicine. The device, which consists of a Josephson junction embedded into a THz spiral antenna and connected to a microwave readout line, uses the non-linearity of the Josephson current to down-convert the information at lower frequency.

Main references :

  • Ion-irradiated YBa2Cu3O7 Josephson arrays for high-frequency mixing A. Sharafiev, M. Malnou, C. Feuillet-Palma, C. Ulysse, P. Febvre, J. Lesueur and N. Bergeal.
    Supercond. Sci. Technol. (2018) in press
  • Josephson oscillation linewidth of ion-irradiated YBa2Cu3O7 junctions A Sharafiev, M Malnou, C. Feuillet-Palma, C. Ulysse, P. Febvre, J. Lesueur and N. Bergeal.
    Supercond. Sci. Technol. 29, 074001 (2016)
  • High-Tc superconducting quantum interference filters (SQIFs) made by ion irradiation S. Ouanani, J. Kermorvant, C. Ulysse, M. Malnou, Y. Lemaître, B. Marcilhac, C. Feuillet-Palma, N. Bergeal, D. Crété, J. Lesueur
    Supercond. Sci. Technol. 29, 094002 (2016)
  • High-Tc superconducting Josephson mixers for terahertz heterodyne detection M. Malnou, C. Feuillet-Palma, C. Ulysse, G. Faini, P. Febvre, M. Sirena, L. Olanier, J. Lesueur & N. Bergeal
    J. Appl. Phys. 116, 074505 (2014).
  • YBCO Josephson junctions and strip-lines for RSFQ circuits made by ion irradiation, T. Wolf, N. Bergeal, J. Lesueur, C. J. Fourie, G. Faini, C. Ulysse and P. Febvre,
    IEEE Trans. Appl. Supercond. 23, 1101205 (2013)
  • Toward terahertz heterodyne detection with superconducting Josephson nanojunctions, M. Malnou, A. Luo, T. Wolf, Y. Wang, C. Feuillet-Palma, C. Ulysse, G. Faini, P. Febvre, J. Lesueur, N. Bergeal.
    Appl. Phys. Lett. 101, 233505 (2012)
  • High-Tc Superconducting Quantum Interferences Devices made by ion irradiation, N. Bergeal, J. Lesueur, G. Faini, M. Aprili, J-P. Contour
    Appl. Phys. Lett. 89, 112515 (2006)
  • High Quality Planar High-Tc Josephson Junctions,N. Bergeal, X. Grison, J. Lesueur, G. Faini, M. Aprili, J. P. Contour,
    Appl. Phys. Lett. 87, 102502 (2005)