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

Shiro Kawabata (Institutionen för mikroteknologi och nanovetenskap) ; Y. Asano ; Y. Tanaka ; S. Kashiwaya ; A. A. Golubov
Physica C-Superconductivity and Its Applications (0921-4534). Vol. 468 (2008), 7-10, p. 701-704.
[Artikel, refereegranskad vetenskaplig]

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 pi 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 pi junction behaviors. By deriving the effective action from microscopic Hamiltonian, a pi 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.

Nyckelord: Josephson junction, ferromagnetic insulator, spintronics, quantum, computer, Green's function method, qubit

Denna post skapades 2013-01-28.
CPL Pubid: 172258


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Institutionen för mikroteknologi och nanovetenskap


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Chalmers infrastruktur