Macroscopic quantum dynamics of π junctions with ferromagnetic insulators

Kawabata, Shiro and Kashiwaya, Satoshi and Asano, Yasuhiro and Tanaka, Yukio and Golubov, Alexander A. (2006) Macroscopic quantum dynamics of π junctions with ferromagnetic insulators. Physical Review B: Condensed matter and materials physics, 74 (18). p. 180502. ISSN 1098-0121

PDF
Restricted to UT campus only: Request a copy
159Kb

Abstract:	We theoretically investigate the macroscopic quantum dynamics of a π junction with a superconductor (S) and a multiferroic material or a ferromagnetic insulator (FI). By deriving the effective action from a microscopic Hamiltonian, a π-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 π junctions and show that the influence of the quasiparticle dissipation on MQT is negligibly small.
Item Type:	Article
Copyright:	© 2006 The American Physical Society
Faculty:	Science and Technology (TNW)
Research Group:	Low Temperatures - Biomagnetism (LT)
Link to this item:	http://purl.utwente.nl/publications/74266
Official URL:	http://dx.doi.org/10.1103/PhysRevB.74.180502
Export this item as:	BibTeX EndNote HTML Citation Reference Manager

Show download statistics for this publication

Repository Staff Only: item control page

Metis ID: 233434