volume 74 issue 18 publication number 180502

Macroscopic quantum dynamics of π junctions with ferromagnetic insulators

SHIRO KAWABATA 1, 2
Satoshi Kashiwaya 3
YASUHIRO ASANO 4
Yukio TANAKA 5
Alexander A Golubov 1
Publication typeJournal Article
Publication date2006-11-08
scimago Q1
wos Q2
SJR1.303
CiteScore6.2
Impact factor3.7
ISSN24699950, 24699969, 10980121, 1550235X
Electronic, Optical and Magnetic Materials
Condensed Matter Physics
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.
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KAWABATA S. et al. Macroscopic quantum dynamics of π junctions with ferromagnetic insulators // Physical Review B. 2006. Vol. 74. No. 18. 180502
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KAWABATA S., Kashiwaya S., ASANO Y., TANAKA Y., Golubov A. A., Golubov A. A. Macroscopic quantum dynamics of π junctions with ferromagnetic insulators // Physical Review B. 2006. Vol. 74. No. 18. 180502
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RIS Copy
TY - JOUR
DO - 10.1103/physrevb.74.180502
UR - https://doi.org/10.1103/physrevb.74.180502
TI - Macroscopic quantum dynamics of π junctions with ferromagnetic insulators
T2 - Physical Review B
AU - KAWABATA, SHIRO
AU - Kashiwaya, Satoshi
AU - ASANO, YASUHIRO
AU - TANAKA, Yukio
AU - Golubov, Alexander A
AU - Golubov, Alexander A.
PY - 2006
DA - 2006/11/08
PB - American Physical Society (APS)
IS - 18
VL - 74
SN - 2469-9950
SN - 2469-9969
SN - 1098-0121
SN - 1550-235X
ER -
BibTex
Cite this
BibTex (up to 50 authors) Copy
@article{2006_KAWABATA,
author = {SHIRO KAWABATA and Satoshi Kashiwaya and YASUHIRO ASANO and Yukio TANAKA and Alexander A Golubov and Alexander A. Golubov},
title = {Macroscopic quantum dynamics of π junctions with ferromagnetic insulators},
journal = {Physical Review B},
year = {2006},
volume = {74},
publisher = {American Physical Society (APS)},
month = {nov},
url = {https://doi.org/10.1103/physrevb.74.180502},
number = {18},
pages = {180502},
doi = {10.1103/physrevb.74.180502}
}