Cooper pair transport and macroscopic quantum dynamics in Josephson junctions through ferromagnetic insulators

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Kawabata, Shiro and Asano, Yasuhiro and Tanaka, Yukio and Kashiwaya, Satoshi and Golubov, Alexander A. (2008) Cooper pair transport and macroscopic quantum dynamics in Josephson junctions through ferromagnetic insulators. Physica C: Superconductivity, 468 (7-10). pp. 701-704. ISSN 0921-4534

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Abstract:We theoretically investigate the cooper pair transport and the macroscopic quantum dynamics of a Josephson junction with a superconductor (S) and a ferromagnetic insulator (FI). By use of the recursive Green’s function method, we numerically found the formation of the π junction in the case of the fully spin-polarized FI. On the other hand, the Josephson current through the spin filtering barrier does not show the π junction behaviors. By deriving the effective action from microscopic Hamiltonian, a π junction flux qubit is proposed. In this qubit, a quantum two-level system is spontaneously generated and the effect of the quasiparticle dissipation is found to be very weak. These features make it possible to realize a quiet qubit with high coherency.
Item Type:Article
Copyright:© 2008 Elsevier
Faculty:
Science and Technology (TNW)
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Link to this item:http://purl.utwente.nl/publications/79058
Official URL:http://dx.doi.org/10.1016/j.physc.2007.11.069
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