Theory of macroscopic quantum tunneling in Nb/Au/YBCO Josephson junctions

S. Kawabata, A.A. Golubov, Ariando, C.J.M. Verwijs, H. Hilgenkamp

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Abstract

We have theoretically investigated macroscopic quantum tunneling (MQT) in s-wave/d-wave (Nb/Au/YBCO) Josephson junctions, and the influence of the nodal-quasiparticle and the zero energy bound states (ZES) on MQT. In contrast to d-wave/d-wave junctions, low-energy quasiparticle excitations resulting from nodal-quasiparticles and ZES are suppressed due to the finite isotropic gap of the s-wave superconductor. Therefore, the inherent dissipation of these junctions is weak. This result suggests the high potential of s-wave/d-wave hybrid junctions for applications in quantum information devices.
Original languageEnglish
Pages (from-to)80-83
JournalPhysica C
Volume463-465
DOIs
Publication statusPublished - 2007

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Keywords

  • METIS-242862
  • IR-75088

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