Study of nonlocal correlation of Cooper-pair tunnelings in systems of small Josephson junctions

• Project/Area Number: 24340067
• Research Category: Grant-in-Aid for Scientific Research (B)
• Allocation Type: Partial Multi-year Fund
• Section: 一般
• Research Field: Condensed matter physics I
• Research Institution: The University of Electro-Communications
• Principal Investigator: SHIMADA Hiroshi 電気通信大学, 情報理工学(系)研究科, 准教授 (60216067)
• Co-Investigator(Renkei-kenkyūsha): MIZUGAKI Yoshinao 電気通信大学, 情報理工学研究科, 教授 (30280887)
• Project Period (FY): 2012-04-01 – 2015-03-31
• Project Status: Completed (Fiscal Year 2014)
• Budget Amount: ¥17,160,000 (Direct Cost: ¥13,200,000、Indirect Cost: ¥3,960,000); Fiscal Year 2014: ¥3,380,000 (Direct Cost: ¥2,600,000、Indirect Cost: ¥780,000); Fiscal Year 2013: ¥4,940,000 (Direct Cost: ¥3,800,000、Indirect Cost: ¥1,140,000); Fiscal Year 2012: ¥8,840,000 (Direct Cost: ¥6,800,000、Indirect Cost: ¥2,040,000)
• Keywords: 微小ジョセフソン接合 / 電流ドラッグ / 電流ミラー / 非局所相関 / ブロッホ振動 / JQPサイクル / 接合列 / 帯電効果 / 電流誘引 / 電流プラトー / 交流ジョセフソン効果 / Bloch振動

Outline of Final Research Achievements

We have experimentally shown that application of high-frequency radiation in a range 100 kHz-170 GHz to an array of small Josephson junctions weaken its Coulomb blockade of Cooper-pair tunneling and induce conductance in the array. There exists a correlation between currents in two arrays of small Josephson junctions separated by a distance of the order of 10 um. We have demonstrated that this can be understood quantitatively if we assume that a current in one array induces an ac voltage in the other array the magnitude of which is proportional to the square root of the current in the first. We have also investigated I-V characteristics of an array of small junctions connected to SQUID arrays which serve as its environmental impedance. We showed a clear Bloch oscillation when the environmental impedance was large as well as current plateaus superposed. The latter has turned out due to a kind of nonlocal interaction of the tunnelings in the SQUID arrays and those in the junction array.

Research Products

• [Journal Article] 量子電流ミラー効果に基づく高精度な電流整数倍器の実現に向けた研究 (2015)
  • Author(s): 武田晃一, 宮脇健至, ガンドロシュラ・スリニワス, 石田千尋, 萩原彩乃, 水柿義直, 島田宏
  • Journal Title: IEICE Technical Report Volume: SCE2014-49 Pages: 1-6
  • Acknowledgement Compliant
• [Journal Article] Characterization of Superconducting Single-Electron Transistors with Small Al/AlOx/V Josephson Junctions (2014)
  • Author(s): H. Shimada, K. Miyawaki, A. Hagiwara, K. Takeda, and Y. Mizugaki
  • Journal Title: Superconductor Science and Technology Volume: 27 Issue: 11 Pages: 115015-115015
  • DOI: 10.1088/0953-2048/27/11/115015
  • Peer Reviewed / Acknowledgement Compliant
• [Journal Article] Precision improvement of the current multiplier based on the quantum current-mirror effect (2014)
  • Author(s): K. Takeda, C. Ishida, S. Gandrothula, Y. Mizugaki, and H. Shimada
  • Journal Title: Japanese Journal of Applied Physics Volume: 53 Issue: 2 Pages: 023101-023101
  • DOI: 10.7567/jjap.53.023101
  • NAID: 210000143324
• [Journal Article] Drag Current Reversal in Capacitively Coupled Arrays of Small Josephson Junctions (2012)
  • Author(s): Hiroshi Shimada, Chihiro Ishida, and Yoshinao Mizugaki
  • Journal Title: Physical Review Letters Volume: 109 Issue: 19
  • DOI: 10.1103/physrevlett.109.196801
  • Peer Reviewed
• [Presentation] 微小Josephson接合列におけるBloch振動と電流プラトーの観測 (2015)
  • Author(s): 島田宏、鹿取俊介、出口智明、水柿義直
  • Organizer: 日本物理学会
  • Place of Presentation: 早稲田大学、東京
  • Year and Date: 2015-03-21 – 2015-03-24
• [Presentation] 二重微小Josephson接合における接合間のトンネル過程の相互作用 (2015)
  • Author(s): 松原明志、水柿義直、島田宏
  • Organizer: 日本物理学会
  • Place of Presentation: 早稲田大学、東京
  • Year and Date: 2015-03-21 – 2015-03-24
• [Presentation] 量子電流ミラー効果に基づく高精度な電流整数倍器の実現に向けた研究 (2015)
  • Author(s): 武田晃一、宮脇健至、ガンドロシュラ・スリニワス、石田千尋、萩原彩乃、水柿義直、島田宏
  • Organizer: 電子情報通信学会超伝導エレクトロニクス研究会
  • Place of Presentation: 機械振興会館、東京
  • Year and Date: 2015-01-22
• [Presentation] 微小なAl/AlOx/V接合を用いた超伝導単一電子トランジスタ (2014)
  • Author(s): 宮脇健至、水柿義直、島田宏
  • Organizer: 応用物理学会
  • Place of Presentation: 北海道大学、札幌
  • Year and Date: 2014-09-17 – 2014-09-20
• [Presentation] 量子電流ミラー効果における電流誘引過程の非局所性 (2014)
  • Author(s): 武田晃一、水柿義直、島田宏
  • Organizer: 日本物理学会
  • Place of Presentation: 中部大学、春日井
  • Year and Date: 2014-09-07 – 2014-09-10
• [Presentation] 微小Josephson接合列を用いた電流整数倍器の高精度化 (2013)
  • Author(s): 武田晃一、Srinivas Gandrothula、水柿義直、島田宏
  • Organizer: 神奈川工科大学
  • Place of Presentation: 神奈川工科大学
  • Year and Date: 2013-03-28
• [Presentation] Al/AlO_x/V Josephson接合を用いた単一Cooper対素子 (2013)
  • Author(s): 宮脇健至、萩原彩乃、小谷祥生、水柿義直、島田宏
  • Organizer: 電子情報通信学会
  • Place of Presentation: 岐阜大学
  • Year and Date: 2013-03-22
• [Presentation] Current -Induction Phenomena in Capacitively Coupled Linear Arrays of Small Josephson Junctions (2013)
  • Author(s): H. Shimada
  • Organizer: Low Dimensional Science 2013 Conference
  • Place of Presentation: Huisun Forest, Nantou Taiwan
  • Invited
• [Presentation] Current Induction Phenomena in Capacitively Coupled Linear Arrays of Mesoscopic Josephson Junctions (2013)
  • Author(s): H. Shimada
  • Organizer: The first international workshop MIPT-UEC
  • Place of Presentation: Lebedev Institute, Moscow
• [Presentation] Towards precise current multiplication by use of linear arrays of small Josephson junctions (2013)
  • Author(s): K. Takeda
  • Organizer: The first international workshop MIPT-UEC
  • Place of Presentation: Lebedev Institute, Moscow
• [Presentation] Towards precise current multiplication by use of linear arrays of small Josephson junctions (2013)
  • Author(s): K. Takeda, S. Gandrothula, Y. Mizugaki, and H. Shimada
  • Organizer: International Symposium on Nanoscale Transport and Technology
  • Place of Presentation: Atsugi, Kanagawa
• [Presentation] Observation of Bloch oscillation and current plateaus in an array of small Josephson junctions embedded in dc-SQUIDs network (2013)
  • Author(s): S. Gandrothula, S. Katori, T. Deguchi, Y. Mizugaki, and H. Shimada
  • Organizer: International Symposium on Nanoscale Transport and Technology
  • Place of Presentation: Atsugi, Kanagawa
• [Presentation] Observation of Bloch oscillation and current plateaus in an array of small Josephson junctions embedded in dc-SQUIDs network (2013)
  • Author(s): S. Gandrothula, S. Katori, T. Deguchi, Y. Mizugaki, and H. Shimada
  • Organizer: 3rd International Conference on Nanotek and Expo
  • Place of Presentation: Las Vegas, USA
• [Presentation] 微小Josephson 接合列における Bloch 振動と電流プラトー (2013)
  • Author(s): 出口智明, 鹿取俊介, Srinivas Gandrothula, 水柿義直, 島田宏
  • Organizer: 第74回応用物理学会秋季学術講演会
  • Place of Presentation: 同志社大学京田辺キャンパス, 京都
• [Presentation] 微小ジョセフソン接合列間の量子電流ミラー効果に見られる二面性 (2013)
  • Author(s): 島田宏, 武田晃一, 水柿義直
  • Organizer: 電子情報通信学会 2013ソサエティ大会
  • Place of Presentation: 福岡工業大学, 福岡
• [Presentation] 量子電流ミラー効果に基づく微小電流の整数倍器 (2013)
  • Author(s): 武田晃一, 水柿義直, 島田宏
  • Organizer: 電子情報通信学会 2013ソサエティ大会
  • Place of Presentation: 福岡工業大学, 福岡