Macroscopic quantum tunneling and quasiparticle-tunneling blockade effect in s-wave/d-wave hybrid junctions

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

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Abstract

We have theoretically investigated macroscopic quantum tunneling (MQT) and the influence of nodal quasiparticles and zero energy bound states (ZESs) on MQT in s-wave/d-wave hybrid Josephson junctions. In contrast to d-wave/d-wave junctions, the low-energy quasiparticle dissipation resulting from nodal quasiparticles and ZESs is suppressed due to a quasiparticle-tunneling blockade effect in an isotropic s-wave superconductor. Therefore, the inherent dissipation in these junctions is found to be weak. We have also investigated MQT in a realistic s-wave/d-wave (Nb/Au/YBCO) junction in which Ohmic dissipation in a shunt resistance is stronger than the inherent dissipation and find that MQT is observable within the current experimental technology. This result suggests the high potential of s-wave/d-wave hybrid junctions for applications in quantum information devices.
Original languageEnglish
Article number064505
JournalPhysical review B: Condensed matter and materials physics
Volume76
Issue number6
DOIs
Publication statusPublished - 2007

Keywords

  • METIS-242857
  • IR-59153

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