Josephson effect and Leggett mode in multi-gap intrinsic Josephson junctions

• Project/Area Number: 22540358
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Single-year Grants
• Section: 一般
• Research Field: Condensed matter physics II
• Research Institution: Tohoku University
• Principal Investigator: KOYAMA Tomio 東北大学, 金属材料研究所, 助教 (30153696)
• Co-Investigator(Renkei-kenkyūsha): MACHIDA Masahiko 日本原子力研究開発機構, 計算科学技術 センター, 研究主幹 (60360434)
• Project Period (FY): 2010 – 2012
• Project Status: Completed (Fiscal Year 2012)
• Budget Amount: ¥4,160,000 (Direct Cost: ¥3,200,000、Indirect Cost: ¥960,000); Fiscal Year 2012: ¥780,000 (Direct Cost: ¥600,000、Indirect Cost: ¥180,000); Fiscal Year 2011: ¥910,000 (Direct Cost: ¥700,000、Indirect Cost: ¥210,000); Fiscal Year 2010: ¥2,470,000 (Direct Cost: ¥1,900,000、Indirect Cost: ¥570,000)
• Keywords: 固有ジョセフソン効果 / 多ギャップ超伝導体 / レゲットモード / 固有ジョセフソン接合 / レゲット・モード

Research Abstract

A theory for the Leggett mode in Josephson junctions made of multi-gap superconductors has been constructed. The effect originating from the resonance between the Legget mode and the Josephson oscillations has been clarified in intrinsic Josephson junction stacks on the basis of this theory.

Research Products

• [Journal Article] Nonlocal Ginzburg-Landau Theory for Superconductors (2013)
  • Author(s): T. Koyama and M. Machida
  • Journal Title: Physica C Volume: 484 Pages: 100-103
  • DOI: 10.1016/j.physc.2012.02.019
  • Peer Reviewed
• [Journal Article] The Electric Field Effect and Electromagnetic Emission in Intrinsic Josephson Junctions (2013)
  • Author(s): T. Koyama
  • Journal Title: Supercond. Sci. Technol Volume: 2 Issue: 4 Pages: 45018-45018
  • DOI: 10.1088/0953-2048/26/4/045018
  • Peer Reviewed
• [Journal Article] Electromagnetic Wave Emission from Intrinsic Josephson Junction Stacks: A Review ofTheory and Simulation (2012)
  • Author(s): M. Machida, Y. Ota, T. Koyama and M.Matsumoto
  • Journal Title: J. Phys. Conf. Ser Volume: 393 Pages: 12013-12013
  • Peer Reviewed
• [Journal Article] Direct Numerical Simulation for Non-Equilibrium Transport Phenomena in Superconducting Detectors (2012)
  • Author(s): Y. Ota, K. Kobayashi, M. Machida, T.Koyama and F. Nori
  • Journal Title: Physics Procedia Volume: 27 Pages: 352-355
  • DOI: 10.1016/j.phpro.2012.03.483
  • Peer Reviewed
• [Journal Article] Electromagnetic Wave Emission from Intrinsic Josephson Junction Stacks (2012)
  • Author(s): M. Machida
  • Journal Title: J. Phys. Conf. Ser. Volume: 393 Pages: 12013-12013
  • Peer Reviewed
• [Journal Article] Numerical Study for Electromagnetic Wave Emission in Thin Samples of Intrinsic Josephson Junctions (2011)
  • Author(s): T. Koyama, H. Matsumoto, Y. Ota and M.Machida
  • Journal Title: Physica C Volume: 471 Issue: 21-22 Pages: 1202-1205
  • DOI: 10.1016/j.physc.2011.05.159
  • Peer Reviewed
• [Journal Article] Theory of Phase Dynamics in Intrinsic Josephson Junctions withmulti-gap superconducting layers (2011)
  • Author(s): Y. Ota, M. Machida and T. Koyama
  • Journal Title: Physica C Volume: 471 Issue: 21-22 Pages: 760-762
  • DOI: 10.1016/j.physc.2011.05.047
  • Peer Reviewed
• [Journal Article] Macroscopic Quantum Tunneling Induced by a Spontaneous Field in Intrinsic Josephson Junctions (2011)
  • Author(s): Y. Chizaki, H. Kashiwaya, S. Kashiwaya, T. Koyama and S. Kawabata
  • Journal Title: Physica C Volume: 471 Issue: 21-22 Pages: 758-759
  • DOI: 10.1016/j.physc.2011.05.046
  • Peer Reviewed
• [Journal Article] Multi-scale Simulation for Terahertz Wave Emission from the Intrinsic Josephson Junctions (2011)
  • Author(s): T. Koyama, H. Matsumoto, M. Machida and Y. Ota
  • Journal Title: Supercond. Sci. Technol Volume: 24 Issue: 8 Pages: 85007-85007
  • DOI: 10.1088/0953-2048/24/8/085007
  • Peer Reviewed
• [Journal Article] Resonant Effect in the Voltage State of Intrinsic Josephson Junction Stacks with Multiple Tunneling Channels (2011)
  • Author(s): T. Koyama, Y. Ota and M. Machida
  • Journal Title: Phys. Rev. B Volume: 83 Issue: 22
  • DOI: 10.1103/physrevb.83.220501
  • Peer Reviewed
• [Journal Article] Variety of c-Axis Collective Excitations in Layered Multigap Superconductors (2011)
  • Author(s): Y. Ota, M. Machida and T. Koyama
  • Journal Title: Phys. Rev. Lett Volume: 106 Issue: 15
  • DOI: 10.1103/physrevlett.106.157001
  • Peer Reviewed
• [Journal Article] Collective Modes in Multiband Superfluids and Superconductors (2011)
  • Author(s): Y. Ota, M. Machida, T. Koyama and H.Aoki
  • Journal Title: Phys. Rev. B Volume: 83 Issue: 6
  • DOI: 10.1103/physrevb.83.060507
  • Peer Reviewed
• [Journal Article] Macroscopic Quantum Tunneling in Multigap Superconducting Josephson Junctions:Enhancement of Escape Rate via Quantum Fluctuations of the Josephson-Leggett Mode (2011)
  • Author(s): Y. Ota, M. Machida and T. Koyama
  • Journal Title: Phys. Rev. B Volume: 83 Issue: 6
  • DOI: 10.1103/physrevb.83.060503
  • Peer Reviewed
• [Journal Article] Emission of Terahertz Electromagnetic Waves from Intrinsic Josephson Junction Arrays Embedded in Resonance LCR Circuits (2011)
  • Author(s): M.Tachiki
  • Journal Title: Phys.Rev.B Volume: Vol.83 Issue: 1
  • DOI: 10.1103/physrevb.83.014508
  • Peer Reviewed
• [Journal Article] Emission of terahertz electromagnetic waves from intrinsic Josephson junction arrays embedded in resonance LCR circuits (2011)
  • Author(s): M.Tachiki
  • Journal Title: Phys.Rev.B Volume: 83
  • Peer Reviewed
• [Journal Article] Macroscopic quantum tunneling in multigap superconducting Josephson junctions : enhancement of escape rate via quantum fluctuations of the Josephson-Leggett mode (2011)
  • Author(s): Y.Ota
  • Journal Title: Phys.Rev.B Volume: 83
  • Peer Reviewed
• [Journal Article] Collective modes in multiband superfluids and superconductors (2011)
  • Author(s): Y.Ota
  • Journal Title: Phys.Rev.B Volume: 83
  • Peer Reviewed
• [Journal Article] Variety of c-axis collective excitations in layered multi-gap superconductors (2011)
  • Author(s): Y.Ota
  • Journal Title: Phys.Rev.Lett. Volume: 106
  • Peer Reviewed
• [Journal Article] Resonant effect in the voltage state of intrinsic Josephson junction stacks with multiple tunneling channels (2011)
  • Author(s): T.Koyama
  • Journal Title: Phys.Rev.B Volume: 83
  • Peer Reviewed
• [Journal Article] Multi-scale simulation for terahertz wave emission from the intrinsic Josephson junctions (2011)
  • Author(s): T.Koyama
  • Journal Title: Supercond.Sci.Technol. Volume: 24
  • Peer Reviewed
• [Journal Article] Numerical study for electromagnetic wave emission in thin samples of intrinsic Josephson junctions (2011)
  • Author(s): T.Koyama
  • Journal Title: Physica C Volume: 471 Pages: 1202-1205
  • Peer Reviewed
• [Journal Article] Collective Modes andJosephson Vortices in a Heterotic Josephson Junction between Single- and Two-gap Superconductors (2010)
  • Author(s): Y. Ota, M. Machida, T. Koyama and H.Matsumoto
  • Journal Title: Physica C Volume: 470 Pages: S882-S883
  • DOI: 10.1016/j.physc.2009.10.023
  • Peer Reviewed
• [Journal Article] Inter-grain Josephson Currents in Two-gap Superconductors (2010)
  • Author(s): Y. Ota, M. Machida and T. Koyama
  • Journal Title: Physica C Volume: 470 Pages: S489-S490
  • DOI: 10.1016/j.physc.2009.11.016
  • Peer Reviewed
• [Journal Article] Numerical Simulations for THz Wave Emission from High-Tc Intrinsic Josephson Junctions (2010)
  • Author(s): T. Koyama, H. Matsumoto and M. Machida
  • Journal Title: Physica C Volume: 470 Pages: S230-S231
  • DOI: 10.1016/j.physc.2009.11.021
  • Peer Reviewed
• [Journal Article] Theory of Josephson Effects inIron-based Multi-gap Superconductor Junctions (2010)
  • Author(s): Y. Ota, M. Machida and T. Koyama
  • Journal Title: J. Phys. Conf. Ser Volume: 248 Pages: 012040-012040
  • DOI: 10.1088/1742-6596/248/1/012040
  • Peer Reviewed
• [Journal Article] Theory and Simulation of Electromagnetic Wave Emission from Intrinsic Josephson Junctions (2010)
  • Author(s): M Machida, Y Ota, N Sasa, T Koyama, H Matsumoto
  • Journal Title: Journal of Physics Volume: Vol.248 Pages: 12037-12037
  • DOI: 10.1088/1742-6596/248/1/012037
  • Peer Reviewed
• [Journal Article] Shapiro Steps as a Direct Probe of pm s-wave Symmetry in Multi-gap Superconducting JosephsonJunctions (2010)
  • Author(s): Y. Ota, M. Machida, T. Koyama and H.Matsumoto
  • Journal Title: Phys. Rev. B Volume: 82 Issue: 14
  • DOI: 10.1103/physrevb.82.140509
  • Peer Reviewed
• [Journal Article] Theory of vortex structure in Josephson junctions with multiple tunneling channels : vortex enlargement as a proof of s-wave superconductivity. (2010)
  • Author(s): Y.Ota
  • Journal Title: Phys.Rev.B Volume: 81
  • Peer Reviewed
• [Journal Article] Ambegaokar-Baratoff relation for Josephson critical current in heterojunctions with multi-gap superconductors. (2010)
  • Author(s): Y.Ota
  • Journal Title: Phys.Rev.B Volume: 81
  • Peer Reviewed
• [Journal Article] First-principal calculations for anisotropy of iron-based superconductors. (2010)
  • Author(s): H.Nakamura
  • Journal Title: Physica C Volume: 470 Pages: 1066-1069
  • Peer Reviewed
• [Journal Article] Anomalous Josephson vortex solutions in Josephson junctions with multiple tunneling channels. (2010)
  • Author(s): Y.Ota
  • Journal Title: Physica C Volume: 470 Pages: 1137-1140
  • Peer Reviewed
• [Journal Article] I-V characteristics in multi-gap intrinsic Josephson junction stacks. (2010)
  • Author(s): T.Koyama
  • Journal Title: Physica C Volume: 470 Pages: 1481-1484
  • Peer Reviewed
• [Journal Article] Shapiro steps as a direct prove s-wave symmetry in multi-gap supercondcuting Josephson junctions. (2010)
  • Author(s): Y.Ota
  • Journal Title: Phys.Rev.B Volume: 82
  • Peer Reviewed
• [Journal Article] Electrodynamics and Intrinsic Josephson effects in multi-gap superconductors. (2010)
  • Author(s): T.Koyama
  • Journal Title: J.Phys.Conf.Ser. Volume: 248
  • Peer Reviewed
• [Journal Article] Theory of Josephson effects in iron-based multi-gap superconductor junctions. (2010)
  • Author(s): Y.Ota
  • Journal Title: J.Phys.Conf.Ser. Volume: 248
  • Peer Reviewed
• [Journal Article] Inter-grain Josephson currents in two-gap superconductors. (2010)
  • Author(s): Y.Ota
  • Journal Title: Physica C Volume: 470
  • Peer Reviewed
• [Journal Article] Collective modes and Josephson vortices in a hetero Josephson junction between single and two-gap superconductors. (2010)
  • Author(s): Y.Ota
  • Journal Title: Physica C Volume: 470
  • Peer Reviewed
• [Presentation] 固有ジョセフソン接合からのTz発振の新機構、(招待講演) (2013)
  • Author(s): 小山富男
  • Organizer: 日本物理学会第68年次大会
  • Place of Presentation: 広島
  • Year and Date: 2013-03-26
• [Presentation] 固有ジョセフソン接合からのＴＨｚ発振の新機構 (2013)
  • Author(s): 小山富男
  • Organizer: 日本物理学会第６８回年次大会
  • Place of Presentation: 広島大学
  • Invited
• [Presentation] 固有ジョセフソン接合における電界効果とテラヘルツ波発振、(招待講演) (2012)
  • Author(s): 小山富男
  • Organizer: 第20回渦糸物理国内会議
  • Place of Presentation: 岡山
  • Year and Date: 2012-12-09
• [Presentation] Numerical Study forElectromagnetic Wave Emission from Intrinsic Josephson Junction Stacks with a Dielectric Cove",(招待講演) (2012)
  • Author(s): 小山富男
  • Organizer: The 8th International Symposium on Intrinsic Josephson Effects and Plasma Oscillations in Tc Superconductors
  • Place of Presentation: トルコ
  • Year and Date: 2012-06-11
• [Presentation] Numerical Simulations forTHz Emission in IJJ's", (招待講演) (2012)
  • Author(s): 小 山富男
  • Organizer: Path breaking Phase Sciences in Superconductivity 2012
  • Place of Presentation: 大阪
  • Year and Date: 2012-01-13
• [Presentation] Numerical Study for Electromagnetic Wave Emission from Intrinsic Josephson Junction (2012)
  • Author(s): T. Koyama
  • Organizer: The 8th International Symposium on Intrinsic Josephson Effects and Plasma Oscillations
  • Place of Presentation: Izmir, Turkey
  • Invited
• [Presentation] Nonlocal Ginzburg-Landau Theory for Superconductors (2011)
  • Author(s): 小山富男
  • Organizer: 24th International Symposium on Superconductivity
  • Place of Presentation: 東京
  • Year and Date: 2011-10-26
• [Presentation] Numerical Simulations forTHz Emission in IJJ's", (招待講演) (2011)
  • Author(s): 小 山富男
  • Organizer: 2nd JST-DFG Workshop on Terahertz Superconductor Electronics
  • Place of Presentation: ドイツ
  • Year and Date: 2011-10-18
• [Presentation] Numerical Study for Electromagnetic Wave Emission in Thin Samples of Intrinsic Josephson Junctions (2011)
  • Author(s): 小山富男
  • Organizer: 2nd JST-DFG Workshop on Terahertz Superconductor Electronics
  • Place of Presentation: Blaubeuren, Germany(招待講演)
  • Year and Date: 2011-10-18
• [Presentation] Numerical Simulations for Electromagnetic Emission from a Thin Film Device of Intrinsic Josephson Junctions", (招待講演) (2010)
  • Author(s): 小 山富男
  • Organizer: The 7th International Symposium on Intrinsic Josephson Effects and Plasma Oscillations in High temperature Superconductors
  • Place of Presentation: 青森
  • Year and Date: 2010-05-01
• [Book] Composite structures of d-wave and s-wave superconductors" in Superconductors - Materials, Properties and Applications (2012)
  • Author(s): M. Kato, T. Ishida, T. Koyama and M. Machida
  • Publisher: InTech 社
• [Book] Superconductors - Materials, Properties and Applications (2012)
  • Author(s): M. Kato
  • Total Pages: 342
  • Publisher: Composite structures of d-wave and s-wave superconductors