Cooper pair transport and macroscopic quantum dynamics in Josephson junctions through ferromagnetic insulators

被引：11

作者：

Kawabata, Shiro ^{[1
,2
]}

Asano, Yasuhiro ^{[3
]}

Tanaka, Yukio ^{[4
]}

Kashiwaya, Satoshi ^{[1
]}

Golubov, Alexander A. ^{[5
]}

机构：

[1] Natl Inst Adv Ind Sci & Technol, NRI, Tsukuba, Ibaraki 3058568, Japan

[2] Chalmers, MC2, Dept Microtechnol & Nanosci, S-41296 Gothenburg, Sweden

[3] Hokkaido Univ, Dept Appl Phys, Sapporo, Hokkaido 0608628, Japan

[4] Nagoya Univ, Dept Appl Phys, Nagoya, Aichi 4648603, Japan

[5] Univ Twente, Fac Sci & Technol, NL-7500 AE Enschede, Netherlands

来源：

PHYSICA C-SUPERCONDUCTIVITY AND ITS APPLICATIONS | 2008年 / 468卷 / 7-10期

关键词：

Josephson junction; ferromagnetic insulator; spintronics; quantum computer; Green's function method;

D O I：

10.1016/j.physc.2007.11.069

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

We theoretically investigate the cooper pair transport and the macroscopic quantum dynamics of a Josephson junction with a superconductor (S) and a ferromagnetic insulator (FI). By use of the recursive Green's function method, we numerically found the formation of the pi junction in the case of the fully spin-polarized FI. On the other hand, the Josephson current through the spin filtering barrier does not show the pi junction behaviors. By deriving the effective action from microscopic Hamiltonian, a pi junction flux qubit 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. (c) 2008 Elsevier B.V. All rights reserved.

引用

页码：701 / 704

页数：4

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