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

doi:10.1103/PhysRevB.76.064505

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

Faculty of Science and Technology

Research output: Contribution to journal › Article › Academic › peer-review

19 Citations (Scopus)

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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 language	English
Article number	064505
Journal	Physical review B: Condensed matter and materials physics
Volume	76
Issue number	6
DOIs	https://doi.org/10.1103/PhysRevB.76.064505
Publication status	Published - 2007

Keywords

METIS-242857
IR-59153

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title = "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 (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.",

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journal = "Physical review B: Condensed matter and materials physics",

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Macroscopic quantum tunneling and quasiparticle-tunneling blockade effect in s-wave/d-wave hybrid junctions. / Kawabata, S.; Golubov, A.A.; Ariando, A.; Verwijs, C.J.M.; Hilgenkamp, H.; Kirtley, J.R.

In: Physical review B: Condensed matter and materials physics, Vol. 76, No. 6, 064505, 2007.

Research output: Contribution to journal › Article › Academic › peer-review

TY - JOUR

T1 - Macroscopic quantum tunneling and quasiparticle-tunneling blockade effect in s-wave/d-wave hybrid junctions

AU - Kawabata, S.

AU - Golubov, A.A.

AU - Ariando, A.

AU - Verwijs, C.J.M.

AU - Hilgenkamp, H.

AU - Kirtley, J.R.

PY - 2007

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AB - 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.

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KW - IR-59153

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JO - Physical review B: Condensed matter and materials physics

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