Theoretical study on Josephson effect of nanostructure systems in anisotropic superconductors

2010 Fiscal Year Final Research Report

• Project/Area Number: 19740220
• Research Category: Grant-in-Aid for Young Scientists (B)
• Allocation Type: Single-year Grants
• Research Field: Condensed matter physics II
• Research Institution: Akita University (2008-2010); Kanagawa University (2007)
• Principal Investigator: TANUMA Yasunari Akita University, 工学資源学研究科, 准教授 (90360213)
• Project Period (FY): 2007 – 2010
• Keywords: 異方的超伝導 / ジョセフソン効果 / 共鳴束縛状態 / 奇周波数ペア

Research Abstract

I have theoretically studied and investigated in order to determine superconducting pairing symmetries of nanostructure systems in anisotropic superconductors. The internal phase of pair potentials in the tunneling and Josephson junctions cause the formation of the Andreev resonant bound states, where the quasiparticles feel a sign change of the pair potential. We have suggested how to discriminate the pairing symmetries of a chiral p-wave superconductor from the vortex-core tunneling spectroscopy via odd-frequency pairing amplitudes.

Research Products

• [Journal Article] カイラルp波超伝導体の渦糸芯-トンネル分光と奇周波数ペア (2011)
  • Author(s): 田沼慶忠
  • Journal Title: 秋田大学総合情報処理センター広報 14巻 Pages: 2-8
• [Journal Article] Model for vortex-core tunneling spectroscopy of chiral p-wave superconductors via oddfrequency pairing states (2009)
  • Author(s): Y.Tanuma、N.Hayashi、Y.Tanaka、A.A.Golubov
  • Journal Title: Physical Review Letters Vol.102 Pages: 117003
  • Peer Reviewed
• [Journal Article] Odd-frequency pairing state in superconducting junctions (2008)
  • Author(s): Y.Tanaka、A.A.Golubov、Y.Tanuma
  • Journal Title: Journal of Physical Chemistry of Solids Vol.69 Pages: 3244-3266
  • Peer Reviewed
• [Journal Article] Josephson current through a nanoscale quantum dot contacted by conventional superconductors (2007)
  • Author(s): Y.Tanuma、Y.Tanaka、K.Kusakabe
  • Journal Title: Physica E Vol.40 Pages: 257-260
  • Peer Reviewed
• [Journal Article] Odd-frequency pairing in normalmetal/superconductor junctions (2007)
  • Author(s): Y.Tanaka、Y.Tanuma、A.A.Golubov
  • Journal Title: Physical Review B Vol.76 Pages: 054522(13)
  • Peer Reviewed
• [Presentation] カイラルp波超伝導体渦芯周りの奇周波数ペアと不純物散乱II (2010)
  • Author(s): 田沼慶忠、林伸彦、田仲由喜夫、A.A.Golubov
  • Organizer: 日本物理学会
  • Place of Presentation: 岡山大学
  • Year and Date: 2010-03-23
• [Presentation] カイラルp波超伝導体渦芯周りの奇周波数ペアと不純物散乱 (2009)
  • Author(s): 田沼慶忠、林伸彦、田仲由喜夫、A.A.Golubov
  • Organizer: 日本物理学会
  • Place of Presentation: 熊本大学
  • Year and Date: 2009-09-27
• [Presentation] Theoretical study on tunneling spectroscopy of chiral p-wave superconductors with odd-frequency pair amplitudes induced around a vortex core (2009)
  • Author(s): Y.Tanuma、N.Hayashi、Y.Tanaka、A.A.Golubov
  • Organizer: 9^<th> International Conference on Materials and Mechanisms (M2S-IX)
  • Place of Presentation: 京王プラザホテル
  • Year and Date: 2009-09-09
• [Presentation] How to determine pairing symmetries of chiral p-wave superconductors from vortex-core tunneling spectroscopy via odd-frequency pairings (2009)
  • Author(s): Y.Tanuma、N.Hayashi、Y.Tanaka、A.A.Golubov
  • Organizer: New directions of superconducting nanostructures 2009 (NDSN 2009)
  • Place of Presentation: Nagoya University
  • Year and Date: 2009-09-04
• [Presentation] 有限サイズの常伝導・異方的超伝導トンネル接合における奇周波数ペアと不純物効果 (2008)
  • Author(s): 田沼慶忠、田仲由喜夫、A.A. Golubov
  • Organizer: 日本物理学会
  • Place of Presentation: 岩手大学
  • Year and Date: 2008-09-22
• [Presentation] 不純物のあるカイラルp波超伝導ボルテックスと奇周波数ペア検証法 (2008)
  • Author(s): 田沼慶忠
  • Organizer: 京大基研研究会「不均一超伝導超流動状態と量子物理」
  • Place of Presentation: 京都大学基礎物理学研究所
  • Year and Date: 2008-08-01
• [Presentation] 異方的超伝導磁束量子状態における奇周波数ペアと不純物効果 (2008)
  • Author(s): 田沼慶忠、林伸彦、田仲由喜夫、A.A.Golubov
  • Organizer: 日本物理学会
  • Place of Presentation: 近畿大学
  • Year and Date: 2008-03-23
• [Presentation] Odd-frequency pairing states near a superconducting vortex core with the winding number (2007)
  • Author(s): 田沼慶忠、林伸彦、田仲由喜夫、A.A.Golubov
  • Organizer: 第2回若手研究者のための超伝導ナノサイエンスと応用に関する秋季国際セミナー
  • Place of Presentation: ホテルエピナール那須
  • Year and Date: 2007-12-01
• [Presentation] Josephson effet of d-wave superconductors through a nanoscale quantum dot (2007)
  • Author(s): Y.Tanuma、Y.Tanaka、K.Kusakabe
  • Organizer: Spectroscopies in Novel Superconductors (SNS 2007)
  • Place of Presentation: 仙台国際センター
  • Year and Date: 2007-08-20
• [Presentation] Hidden odd-frequency pairing states in non-uniform superconductors (2007)
  • Author(s): Y.Tanuma、Y.Tanaka、A.A.Golubov
  • Organizer: Workshop 'Physics of Nanoscale Superconducting Heterostructures '
  • Place of Presentation: Lorentz Center (Leiden University, Netherlands)
  • Year and Date: 2007-06-23