Macroscopic quantum dynamics of pi-junctions with ferromagnetic insulators

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dc.creatorKawabata, Shiro
dc.creatorKashiwaya, Satoshi
dc.creatorAsano, Yasuhiro
dc.creatorTanaka, Yukio
dc.creatorGolubov, Alexander A.
dc.date2006-08-31
dc.date2006-11-09
dc.date.accessioned2026-07-07T07:19:54Z
dc.date.available2026-07-07T07:19:54Z
dc.descriptionWe 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.
dc.description4 pages, 2 figures
dc.identifierhttps://arxiv.org/abs/cond-mat/0608709
dc.identifierhttp://arxiv.org/abs/cond-mat/0608709
dc.identifierPhys. Rev. B 74 (2006) 180502(R)
dc.identifierdoi:10.1103/PhysRevB.74.180502
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/114799
dc.subjectMesoscale and Nanoscale Physics
dc.subjectSuperconductivity
dc.subjectQuantum Physics
dc.titleMacroscopic quantum dynamics of pi-junctions with ferromagnetic insulators
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