Macroscopic quantum dynamics of pi-junctions with ferromagnetic insulators

Details Macroscopic quantum dynamics of pi-junctions with ferromagnetic insulators Macroscopic quantum dynamics of pi-junctions with ferromagnetic insulators

2006-08-31

arxiv.org/abs/cond-mat/0608709v2

Phys. Rev. B 74 (2006) 180502(R)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

4 pages, 2 figures

Scientific paper

10.1103/PhysRevB.74.180502

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.

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