Macroscopic quantum dynamics of pi-junctions with ferromagnetic insulators

Abstract

We theoretically investigate the macroscopic quantum dynamics of a pi junction with a superconductor (S) and a multiferroic material or a ferromagnetic insulator (FI). By deriving the effective action from a microscopic Hamiltonian, a pi-junction qubit (a S-FI-S superconducting quantum interference device ring) 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. We also investigate macroscopic quantum tunneling (MQT) in current-biased S-FI-S pi junctions and show that the influence of the quasiparticle dissipation on MQT is negligibly small.

4 pages, 2 figures

References in corpus (21)

• Proximity effects in superconductor-ferromagnet heterostructures
• Coupling of two superconductors through a ferromagnet : evidence for a pi-junction
• Multiferroics: different ways to combine magnetism and ferroelectricity
• Electron transport through single Mn12 molecular magnets
• Quiet SDS Josephson Junctions for Quantum Computing
• Spin current in ferromagnet/insulator/superconductor junctions
• Critical Current Oscillations in Strong Ferromagnetic Pi-Junctions
• Half-integer Shapiro steps at the 0-pi crossover of a ferromagnetic Josephson junction
• Superconducting pi qubit with a ferromagnetic Josephson junction
• High quality ferromagnetic 0 and pi Josephson tunnel junctions
• Orbital Physics in the Perovskite Ti Oxides
• Collapse of thermal activation in moderately damped Josephson junctions
• Interplay of spin-discriminated Andreev bound states forming the 0-$\pi$ transition in Superconductor-Ferromagnet-Superconductor Junctions
• High resolution measurements of the switching current in a Josephson tunnel junction: Thermal activation and macroscopic quantum tunneling
• Macroscopic Quantum Tunneling and Quasiparticle Dissipation in d-wave Superconductor Josephson Junctions
• Effect of zero energy bound states on macroscopic quantum tunneling in high-Tc superconductor junctions
• Macroscopic Quantum Tunneling of a Fluxon in a Long Josephson Junction
• Superconducting pi qubit with three Josephson junctions
• The 0 and the pi phase Josephson coupling through an insulating barrier with magnetic impurities
• Fabrication of high quality ferromagnetic Josephson junctions
• Decoherence of Phase Qubit using High-Tc Superconductor

Cited by in corpus (32)

• Rare-earth mononitrides
• Macroscopic quantum tunneling in spin filter ferromagnetic Josephson junctions
• Josephson pi-state in a ferromagnetic insulator
• Tuning of Magnetic Activity in Spin-Filter Josephson Junctions Towards Spin-Triplet Transport
• Ferromagnetic Materials for Josephson π Junctions
• Efficient electron refrigeration using superconductor/spin-filter devices
• Theory of Macroscopic Quantum Tunneling in High-T_c c-Axis Josephson Junctions
• Coexistence and tuning of spin-singlet and triplet transport in spin-filter Josephson junctions
• Electrodynamics of highly spin-polarized tunnel Josephson junctions
• Current-voltage characteristics of tunnel Josephson junctions with a ferromagnetic interlayer
• Supercurrent reversal in ferromagnetic hybrid nanowire Josephson junctions
• Tunable planar Josephson junctions driven by time-dependent spin-orbit coupling
• Electrodynamics of Josephson junctions containing strong ferromagnets
• Macroscopic quantum tunneling and quasiparticle-tunneling blockade effect in s-wave/d-wave hybrid junctions
• Nanoscale spin ordering and spin screening effects in tunnel ferromagnetic Josephson junctions
• Spectrum of Andreev bound states in Josepshon junctions with a ferromagnetic insulator
• Composite excitation of Josephson phase and spin waves in Josephson junctions with ferromagnetic insulator
• Theory of Josephson transport through spintronics nano-structure
• Heat transport and electron cooling in ballistic normal-metal/spin-filter/superconductor junctions
• Anomalous Surface Impedance in a Normal-metal/Superconductor Junction with a Spin-active Interface
• Theory of quantum transport in Josephson junctions with a ferromagnetic insulator
• Effect of d-f hybridization on the Josephson current through Eu-chalcogenides
• Proposal for a nonadiabatic geometric gate with an Andreev spin qubit
• Zero-Field Fiske Resonance Coupled with Spin-waves in Ferromagnetic Josephson Junctions
• Atomic scale 0-pi transition in a high-Tc superconductor/ferromagnetic-insulator/high-T superconductor Josephson junction
• Spin-split superconductivity in spin-orbit coupled hybrid nanowires with ferromagnetic barriers
• Thermally induced 0-pi phase transition in Josephson junctions through a ferromagnetic oxide film
• Evidence of the inverse proximity effect in tunnel magnetic Josephson Junctions
• Numerical study of pi-junction using spin filtering barriers
• Theory of two-dimensional macroscopic quantum tunneling in a Josephson junction coupled with an LC circuit
• A hybrid ferromagnetic transmon qubit: circuit design, feasibility and detection protocols for magnetic fluctuations
• Tunneling Hamiltonian description of the atomic-scale 0-pi transition in superconductor/ferromagnetic-insulator junctions