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

Kawabata, S. and Golubov, A.A. and Ariando and Verwijs, C.J.M. and Hilgenkamp, H. and Kirtley, J.R. (2007) Macroscopic quantum tunneling and quasiparticle-tunneling blockade effect in s-wave/d-wave hybrid junctions. Physical Review B: Condensed matter and materials physics, 76 (6). 064505. ISSN 1098-0121

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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.
Item Type:	Article
Copyright:	© 2007 American Physical Society
Faculty:	Science and Technology (TNW)
Research Group:	Low Temperatures - Biomagnetism (LT)
Link to this item:	http://purl.utwente.nl/publications/59153
Official URL:	http://dx.doi.org/10.1103/PhysRevB.76.064505
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