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
来源：
PHYSICAL REVIEW B | 2006年 / 74卷 / 18期
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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共 51 条
[11]   Multiferroic and magnetoelectric materials [J].
Eerenstein, W. ;
Mathur, N. D. ;
Scott, J. F. .
NATURE, 2006, 442 (7104) :759-765
[12]   Measurement of the current-phase relation of superconductor/ferromagnet/superconductor π Josephson junctions -: art. no. 144505 [J].
Frolov, SM ;
Van Harlingen, DJ ;
Oboznov, VA ;
Bolginov, VV ;
Ryazanov, VV .
PHYSICAL REVIEW B, 2004, 70 (14) :144505-1
[13]  
GAJEK M, CONDMAT0606444
[14]  
Goldman A., 2006, MODERN FERRITE TECHN
[15]   The current-phase relation in Josephson junctions [J].
Golubov, AA ;
Kupriyanov, MY ;
Il'ichev, E .
REVIEWS OF MODERN PHYSICS, 2004, 76 (02) :411-469
[16]   Semiconducting ground state of GdN thin films [J].
Granville, S. ;
Ruck, B. J. ;
Budde, F. ;
Koo, A. ;
Pringle, D. J. ;
Kuchler, F. ;
Preston, A. R. H. ;
Housden, D. H. ;
Lund, N. ;
Bittar, A. ;
Williams, G. V. M. ;
Trodahl, H. J. .
PHYSICAL REVIEW B, 2006, 73 (23)
[17]   Electron transport through single Mn12 molecular magnets [J].
Heersche, H. B. ;
de Groot, Z. ;
Folk, J. A. ;
van der Zant, H. S. J. ;
Romeike, C. ;
Wegewijs, M. R. ;
Zobbi, L. ;
Barreca, D. ;
Tondello, E. ;
Cornia, A. .
PHYSICAL REVIEW LETTERS, 2006, 96 (20)
[18]   Modulation of NiGe/Ge Schottky barrier height by sulfur segregation during Ni germanidation [J].
Ikeda, K ;
Yamashita, Y ;
Sugiyama, N ;
Taoka, N ;
Takagi, S .
APPLIED PHYSICS LETTERS, 2006, 88 (15)
[19]   Environmentally decoupled sds-wave Josephson junctions for quantum computing [J].
Ioffe, LB ;
Geshkenbein, VB ;
Feigel'man, MV ;
Fauchère, AL ;
Blatter, G .
NATURE, 1999, 398 (6729) :679-681
[20]   Spin current in ferromagnet-insulator-superconductor junctions [J].
Kashiwaya, S ;
Tanaka, Y ;
Yoshida, N ;
Beasley, MR .
PHYSICAL REVIEW B, 1999, 60 (05) :3572-3580
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