Quantum transport in high-Tc superconductor/ferromagnet hybrids and its application to quantum bit

2011 Fiscal Year Final Research Report

• Project/Area Number: 22710096
• Research Category: Grant-in-Aid for Young Scientists (B)
• Allocation Type: Single-year Grants
• Research Field: Nanostructural science
• Research Institution: National Institute of Advanced Industrial Science and Technology
• Principal Investigator: KAWABATA Shiro 独立行政法人産業技術総合研究所, ナノシステム研究部門, 主任研究員 (30356852)
• Project Period (FY): 2010 – 2011
• Keywords: 量子コンピュータ / スピントロニクス / ジョセフソン効果 / 磁性半導体 / 高温超伝導体 / 計算物理 / メゾスコピック系

Research Abstract

We have developed a theory of the quantum transport phenomena in high-Tc superconductor/ferromagnetic insulator Josephson junction and found the formation of the pi-junction in such systems. Based on this peculiar result, we have also proposed a coherent quantum bit using such hybrid systems.

Research Products

• [Journal Article] Theory of finite temperature Josephson transport through a ferromagnetic insulator (2012)
  • Author(s): S. Nakamura, S. Souma, M. Ogawa, and S. Kawabata
  • Journal Title: Physics Procedia Volume: Vol.27 Pages: 308-311
  • DOI: DOI:10.1016/j.phpro.2012.03.472
  • Peer Reviewed
• [Journal Article] Tunneling Hamiltonian description of the atomic-scale 0-πtransition in superconductor/ferromagnetic-insulator junctions (2011)
  • Author(s): S. Kawabata, Y. Tanaka, A. A. Golubov, A. S. Vasenko, S. Kashiwaya, and Y. Asano
  • Journal Title: Physica C Volume: Vol.471 Pages: 1199-1201
  • DOI: DOI:10.1016/j.physc.2011.05.158
  • Peer Reviewed
• [Journal Article] Current-voltage characteristics of tunnel Josephson junctions with a ferromagnetic interlayer (2011)
  • Author(s): S. Vasenko, S. Kawabata, A. A. Golubov, M. Yu. Kupriyanov, C. Lacroix, F. S. Bergeret, and F. W. J. Hekking
  • Journal Title: Phys. Rev. B Volume: Vol.84 Pages: 0245241-1-0245241-11
  • DOI: DOI:10.1103/PhysRevB.84.024524
  • Peer Reviewed
• [Journal Article] Atomic scale 0-πtransition in a high-Tc superconductor/ferromagnetic-insulator/high-Tc superconductor Josephson junction (2011)
  • Author(s): S. Kawabata, Y. Tanaka, and Y. Asano
  • Journal Title: Physica E Volume: Vol.43 Pages: 722-725
  • DOI: DOI:10.1016/j.physe.2010.07.038
  • Peer Reviewed
• [Journal Article] Theory of quantum transport in Josephson junctions with a ferromagnetic insulator (2010)
  • Author(s): S. Kawabata, and Y. Asano
  • Journal Title: Low Temp. Phys. Volume: Vol.36 Pages: 915-919
  • DOI: DOI:10.1063/1.3515524
  • Peer Reviewed
• [Journal Article] Effect of Strong Coupling on Collective Macroscopic Quantum Tunneling in Intrinsic Josephson Junctions (2010)
  • Author(s): S. Kawabata, H. Kashiwaya, and S. Kashiwaya
  • Journal Title: Physica C Volume: Vol.470 Pages: S848-S850
  • DOI: DOI:10.1016/j.physc.2010.01.045
  • Peer Reviewed
• [Journal Article] A tunneling Hamiltonian theory of 0-πtransition in d-wave superconductor/ferromagnetic-insulator heterostructures (2010)
  • Author(s): S. Kawabata, S. Kashiway, Y. Tanaka, A. A. Golubov, and Y. Asano
  • Journal Title: Journal of Physics : Conference Series Volume: Vol.248 Pages: 012039-1-012039-7
  • DOI: DOI:10.1088/1742-6596/248/1/012039
  • Peer Reviewed
• [Journal Article] Thermally induced 0-πphase transition in Josephson junctions through a ferromagnetic oxide film (2010)
  • Author(s): S. Kawabata, Y. Asano, Y. Tanaka, A. A. Golubov, and S. Kashiwaya
  • Journal Title: Physica C Volume: Vol.470 Pages: 1496-1498
  • DOI: DOI:10.1016/j.physc.2010.05.147
  • Peer Reviewed
• [Journal Article] Dissipative current in SIFS Josephson junctions (2010)
  • Author(s): A. S. Vasenko, S. Kawabata, A. A. Golubov, and F. W. J. Hekking
  • Journal Title: Physica C Volume: Vol.470 Pages: 863-866
  • DOI: DOI:10.1016/j.physc.2010.02.081
  • Peer Reviewed
• [Journal Article] Multi-junction switching in Bi_2Sr_<1.6> La_<0.4> CuO_<6+δ> intrinsic Josephson junctions (2010)
  • Author(s): A. S. H. Kashiwaya, T. Matsumoto, H. Shibata, H. Eisaki, Y. Yoshida, S. Kawabata, and S. Kashiwaya
  • Journal Title: Appl. Phys. Exp. Volume: Vol.3 Pages: 043101-1-043101-4
  • DOI: DOI:10.1143/APEX.3.043101
  • Peer Reviewed
• [Presentation] 強磁性絶縁体を用いたジョセフソンπ接合の理論 (2012)
  • Author(s): 中村周平、相馬聡文、小川真人、川畑史郎
  • Organizer: 2012年日本物理学年次大会
  • Place of Presentation: 関西学院大学(兵庫県)
  • Year and Date: 2012-03-24
• [Presentation] 強磁性絶縁体を用いたジョセフソンπ接合の理論 (2011)
  • Author(s): 中村周平、相馬聡文、小川真人、川畑史郎
  • Organizer: 第25回量子情報技術研究会
  • Place of Presentation: 大阪大学(大阪府)
  • Year and Date: 2011-11-21
• [Presentation] Theory of finite temperature Josepshon current through a ferromagnetic-insulator (2011)
  • Author(s): S. Nakamura, S. Souma, M. Ogawa, and S. Kawabata
  • Organizer: 24th International Symposium on Superconductivity(ISS2011)
  • Place of Presentation: Tokyo
  • Year and Date: 2011-10-24
• [Presentation] Current-voltage characteristics of SIFS tunnel junctions (2011)
  • Author(s): A. S. Vasenko, S. Kawabata, A. A. Golubov, M. Yu. Kupriyanov, C. Lacroix, F. S. Bergeret, and F. W. J. Hekking
  • Organizer: Superconducting hybrids : from conventional to exotic
  • Place of Presentation: Villard de Lans/France
  • Year and Date: 2011-09-07
• [Presentation] Novel features of DOS in S/F bilayer (2011)
  • Author(s): A. S. Vasenko, S. Kawabata, A. A. Golubov, M. Yu. Kupriyanov, C. Lacroix, F. S. Bergeret, and F. W. J. Hekking
  • Organizer: Moscow International Symposium on Magnetism(MISM2011)
  • Place of Presentation: Moscow/Russia
  • Year and Date: 2011-08-21
• [Presentation] Theory of Josephson transport through ferromagnetic insulators and semiconductors (2011)
  • Author(s): S. Kawabata, Y. Tanaka, S. Kashiwaya, A. S. Vasenko, A. A. Golubov, and Y. Asano
  • Organizer: Moscow International Symposium on Magnetism(MISM2011)
  • Place of Presentation: Moscow/Russia
  • Year and Date: 2011-08-21
• [Presentation] Dynamic properties of SIFS Josephson Junctions (2011)
  • Author(s): A. A. Golubov, A. S. Vasenko, S. Kawabata, M. Yu. Kupriyanov, F. S. Bergeret, and F. W. J. Hekking
  • Organizer: Moscow International Symposium on Magnetism(MISM2011)
  • Place of Presentation: Moscow/Russia
  • Year and Date: 2011-08-21
• [Presentation] Novel Josepshonπ-state in a Ferromagnetic Insulator (2011)
  • Author(s): S. Kawabata, S. Kashiwaya, Y. Tanaka, A. A. Golubov, and Y. Asano
  • Organizer: International Symposium on Nanoscale Transport and Technology(ISNTT2011)
  • Place of Presentation: NTT物性科学基礎研究所(神奈川県)
  • Year and Date: 2011-01-12
• [Presentation] Theory of Josepshonπ-state in a Ferromagnetic Insulators (2010)
  • Author(s): S. Kawabata, S. Kashiwaya, Y. Tanaka, A. A. Golubov, and Y. Asano
  • Organizer: Superconductivity and Magnetism : Hybrid proximity nanostructures and intrinsic phenomena(SM2010)
  • Place of Presentation: Salerno/Italy
  • Year and Date: 2010-09-10
• [Presentation] Theory ofπ-junction in a mesoscopic ferromagnetic-insulator/superconductor hybrid structure (2010)
  • Author(s): S. Kawabata, and Y. Asano
  • Organizer: The 6th International Conference on the Physics and Applications of Spin Related Phenomena in Semiconductors(PASPS-VI)
  • Place of Presentation: 東京大学(東京都)
  • Year and Date: 2010-08-03
• [Presentation] Atomic-scale 0-πtransition in a superconductor/ferromagnetic-insulator heterostructure (2010)
  • Author(s): S. Kawabata, Y. Asano, S. Kashiwaya, Y. Tanaka, and A. A. Golubov, and Y. Asano
  • Organizer: The International conference on Theoretical Physics : Dubna-Nano2010
  • Place of Presentation: Dubna/Russia
  • Year and Date: 2010-07-08
• [Presentation] Josephson transport through a ferromagnet/superconductor hybrid structure and its application to quantum bit (2010)
  • Author(s): S. Kawabata, and Y. Asano
  • Organizer: International Symposium on Physics of Quantum Technology(CREST2010)
  • Place of Presentation: 国立情報学研究所(東京都)
  • Year and Date: 2010-04-08