Theory of quantum transport in Josephson junctions with a ferromagnetic insulator

Abstract

We investigate the Josephson transport through ferromagnetic insulators (FIs) by taking into account the band structure of FIs explicitly. Using the recursive Green's function method, we found the formation of a pi-junction in such systems. Moreover the atomic-scale 0-pi oscillation is induced by increasing the thickness of FI and its oscillation period is universal, i.e., just single atomic layer. Based on these results, we show that stable pi-state can be realized in junctions based on high-Tc superconductors with La${}_2$BaCuO${}_5$ barrier. Such FI-based Josephson junctions may become an element in the architecture of future quantum computers.

6 pages, 5 figures, an invited paper in Low. Temp. Phys., special topics issue on "Quantum coherent effects in superconductors and normal metals"

References in corpus (9)

• Supercurrent reversal in quantum dots
• Macroscopic quantum tunneling in a d-wave high-Tc superconductor
• Enhanced Macroscopic Quantum Tunneling in Bi${}_2$Sr${}_2$CaCu${}_2$O${}_{8+\delta }$ Intrinsic Josephson Junction Stacks
• Decoherence due to nodal quasiparticles in d-wave qubits
• Macroscopic quantum dynamics of pi-junctions with ferromagnetic insulators
• Switching Dynamics of Bi${}_2$Sr${}_2$CaCu${}_2$O${}_{8+\delta }$ Intrinsic Josephson junctions: Macroscopic Quantum Tunneling and Self-Heating Effect
• Decoherence in a superconducting flux qubit with a pi-junction
• Theory of Macroscopic Quantum Tunneling in High-T_c c-Axis Josephson Junctions
• Atomic scale 0-pi transition in a high-Tc superconductor/ferromagnetic-insulator/high-T superconductor Josephson junction

Cited by in corpus (4)

• Current-voltage characteristics of tunnel Josephson junctions with a ferromagnetic interlayer
• High bias anomaly in YBa2Cu3O7/LaMnO_{3+delta}/YBa2Cu3O7 Superconductor/Ferromagnetic Insulator/Superconductor junctions: Evidence for a long-range superconducting proximity effect through the conduction band of a ferromagnetic insulator
• Spectrum of Andreev bound states in Josepshon junctions with a ferromagnetic insulator
• Tunneling Hamiltonian description of the atomic-scale 0-pi transition in superconductor/ferromagnetic-insulator junctions