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

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

PDF
Restricted to UT campus only: Request a copy
215Kb

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)
Research Group:	Low Temperatures - Biomagnetism (LT)
Link to this item:	http://purl.utwente.nl/publications/79058
Official URL:	http://dx.doi.org/10.1016/j.physc.2007.11.069
Export this item as:	BibTeX EndNote HTML Citation Reference Manager

Show download statistics for this publication

Repository Staff Only: item control page

Metis ID: 252559