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


Kawabata, S. and Golubov, A.A. and Ariando and Verwijs, C.J.M. and Hilgenkamp, H. (2007) Theory of macroscopic quantum tunneling in Nb/Au/YBCO Josephson junctions. Physica C: Superconductivity, 463-46 . pp. 80-83. ISSN 0921-4534

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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.

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Additional information:Proceedings of the 19th International Symposium on Superconductivity (ISS 2006)
Science and Technology (TNW)
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