Macroscopic quantum dynamics of π junctions with ferromagnetic insulators

被引:47
作者
Kawabata, Shiro
Kashiwaya, Satoshi
Asano, Yasuhiro
Tanaka, Yukio
Golubov, Alexander A.
机构
[1] Univ Twente, Fac Sci & Technol, NL-7500 AE Enschede, Netherlands
[2] AIST, NRI, Tsukuba, Ibaraki 3058568, Japan
[3] AIST, NeRI, Tsukuba, Ibaraki 3058568, Japan
[4] Hokkaido Univ, Dept Appl Phys, Sapporo, Hokkaido 0608628, Japan
[5] Nagoya Univ, Dept Appl Phys, Nagoya, Aichi 4648603, Japan
关键词
D O I
10.1103/PhysRevB.74.180502
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
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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页数:4
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