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

Abstract

We have theoretically investigated macroscopic quantum tunneling (MQT) and the influence of nodal quasiparticles and zero energy bound states (ZES) 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 ZES 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 very 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 high potential of s-wave/d-wave hybrid junctions for applications in quantum information devices.

4 pages, 3 figures

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• Ferromagnetic Materials for Josephson π Junctions
• Theory of Macroscopic Quantum Tunneling in High-T_c c-Axis Josephson Junctions
• Asymmetric long Josephson junction acting as a ratchet for a quantum field
• Theory of two-dimensional macroscopic quantum tunneling in YBa${}_2$ Cu${}_3$ O${}_{7-\delta }$ Josephson junctions coupled to an LC circuit
• Theory of quantum transport in Josephson junctions with a ferromagnetic insulator
• Two-dimensional macroscopic quantum dynamics in YBCO Josephson junctions
• Atomic scale 0-pi transition in a high-Tc superconductor/ferromagnetic-insulator/high-T superconductor Josephson junction
• Numerical study of pi-junction using spin filtering barriers
• Theory of two-dimensional macroscopic quantum tunneling in a Josephson junction coupled with an LC circuit