Degree

• 理学博士（東京大学 1989-07）
• Doctor of Science（The University of Tokyo）

Research History

Education

Awards

• Best Poster Award（2013-12）
• 日本物理学会論文賞（1999-03）

Others

Papers

• Lateral phonon propagation between superconducting devices on a Si/SiO2 substrate（2025-04-15） [DOI] [Othres link]
• Information processing capabilities of two parallel gold-nanoparticle reservoirs dependent on operation temperatures（2025-02-05） [DOI] [Othres link] [Othres link]
• Operation of RSFQ Hardware Random Number Generator Comprising Two Josephson Oscillators（2024-11） [DOI]
• 単一磁束量子パルス周波数変調型D/A変換器のGHz信号生成回路への応用（2024-10） [DOI]
• Physical reservoir application of random network of gold nanoparticles fabricated by multi-step immersion in gold colloidal solution（2024-05-16） [DOI] [Othres link] [Othres link]
• Asymmetry of the Breakdown near Hot Spots in the Quantum Hall Regime in a Specially Shaped GaAs/AlGaAs Sample（2024-03） [DOI]
• Nonlinear Signal Conversion in Gold-Nanoparticle Random Array for Physical Reservoir Applications（2024-01） [DOI]
• Random Number Generation Utilizing Timing Jitters of Single-Flux-Quantum Propagation（2023-08） [DOI]
• Evaluation of True Random Number Sequences Generated by Utilizing Timing Jitters in Superconducting Integrated Circuits（2023-07-01） [DOI] [Othres link] [Othres link]
• マイクロコントローラを利用した金ナノ粒子誘電泳動の自動停止機構（2022-11-01） [DOI]
• Sensitive phonon detection using a single Cooper-pair transistor（2022-04-21） [DOI]
• Detection of phonons with a single Cooper-pair transistor（2021-08）
• Enhanced Operation Frequencies of Bipolar Double-Flux-Quantum Amplifiers Fabricated Using 10-kA/cm2 Nb/AlOx/Nb Integration Process（2021-07-01） [DOI]
• Scalability of supercurrent modulable with single Cooper-pair transistors connected in parallel（2021-06-24） [DOI]
• Nanoscale Tunnel Junctions and Metallic Single-Electron Transistors via Shadow Evaporation and In Situ Atomic Layer Deposition of Tunnel Barriers（2021-02-12） [DOI]
• Rescaling of applied oscillating voltages in small Josephson junctions（2020-10-12） [DOI]
• Current Distributions in the Vicinity of Electrical Contacts with a Two Dimensional Electron Gas under High Magnetic Fields（2020-10-02） [DOI] [Othres link]
• Design and Error-Rate Evaluation of RSFQ Logic Gates Comprising a Toggle Storage Loop（2020-07-31） [DOI]
• Cooper‑Pair Tunneling in Small Josephson Junction Arrays Under Radio‑Frequency Irradiation（2020-06-13） [DOI]
• Design and Operation of Distributed Double-SQUID Amplifier for RSFQ Circuits（2019-10-15） [DOI]
• 微小Josephson接合列の輻射検出器としての利用性の評価（2019-08-02）
• Evaluation of inter-particle distance of gold nanoparticles dispersed on silane-treated substrates to fabricate dithiol-connected arrays（2019-06） [DOI] [Scopus] [Scopus]
• 1000-fold double-flux-quantum voltage multiplier employing directional propagation of flux quanta through asymmetrically-damped junction branches（2019-01-28） [DOI]
• Single-electron charging effects observed in arrays of gold nanoparticles formed by dielectrophoresis between SAM-coated electrodes（2019-01） [DOI] [Scopus] [Scopus]
• Numerical simulation of single-electron tunneling in random arrays of small tunnel junctions formed by percolation of conductive nanoparticles（2018-10） [DOI] [Scopus] [Scopus]
• One-dimensional array of small tunnel junctions fabricated using 30-nm-diameter gold nanoparticles placed in a 140-nm-wide resist groove（2018-08） [DOI] [Scopus] [Scopus]
• Double-Flux-Quantum Amplifier with a Single-Flux-Biasing Line（2018-07） [DOI]
• Magnetoresistance in single-electron transistors comprising a superconducting island with ferromagnetic leads（2018-04-19） [DOI]
• Thermally-fluctuated single-flux-quantum pulse intervals reflected in input-output characteristics of a double-flux-quantum amplifier（2017-07-26） [DOI]
• Single-Flux-Quantum Bipolar Digital-to-Analog Converter Comprising Polarity-Switchable Double-Flux-Quantum Amplifier（2017-06） [DOI] [Web of Scientce]
• Sharp Switching Characteristics of Single Electron Transistor with Discretized Charge Input（2016-08） [DOI] [Web of Scientce]
• Bloch Oscillation in a One-Dimensional Array of Small Josephson Junctions（2016-07） [DOI] [Web of Scientce]
• Experimental demonstration of single-flux-quantum sequential-access mask ROM（2016-06） [DOI] [Web of Scientce]
• Superconducting bipolar digital-to-analog converter equipped with dual double-flux-quantum amplifier（2016-05） [DOI] [Web of Scientce]
• Improvement of Single-Electron Digital Logic Gates by Utilizing Input Discretizers（2016-02） [DOI] [Web of Scientce]
• Change in the characteristics of an array of small Josephson junctions with an application of high frequency/microwave radiation（2016） [DOI] [CiNii Research (CiNii Articles)]
• Tunneling transport in capacitively coupled arrays of small Josephson junctions（2016） [DOI] [CiNii Research (CiNii Articles)]
• Detection of emission from a superconducting single-electron transistor by an array of small Josephson junctions（2016） [DOI] [CiNii Research (CiNii Articles)]
• Pulse Response of Mutually-Coupled dc-to-SFQ Converter Investigated using an On-Chip Pulse Generator（2015-03） [DOI] [Web of Scientce]
• 21aBK-10 Observation of Bloch oscillation and current plateaus in a linear array of small Josephson junctions（2015） [DOI] [CiNii Research (CiNii Articles)] [CiNii Books]
• Quantum Interference in DC-SQUIDs Comprising Two Sub-Micron Aluminum Josephson Junctions: Deviation from Classical Model（2015） [DOI] [Web of Scientce]
• Design and operation of a 9-bit single-flux-quantum pulse-frequency modulation digital-to-analog converter（2015） [DOI] [Web of Scientce]
• Design and Operation of ROM-Dedicated Single-Flux-Quantum Cell Comprising Splitters and Confluence Buffers（2015） [DOI] [Web of Scientce]
• 4-bit Bipolar Triangle Voltage Waveform Generator Using Single-Flux-Quantum Circuit（2015） [DOI] [Web of Scientce]
• Modified Double-Flux-Quantum Amplifier for Bipolar Voltage Multiplication（2015） [DOI] [Web of Scientce]
• Towards precise current-multiplication based on the quantum current-mirror effect（2015-01）
• Characterization of superconducting single-electron transistors with small Al/AlOx/V Josephson junctions（2014-11） [DOI] [Web of Scientce]
• 9 bit superconductive single-flux-quantum digital-to-analogue converter（2014-10） [DOI] [Web of Scientce]
• Input-output characteristics of a 999-stage double-flux-quantum amplifier designed for 1000-fold voltage multiplication（2014-05） [DOI] [Web of Scientce]
• Correlation between polarity of magnetoresistance ratio and tunnel resistance in ferromagnetic single-electron transistor with superconductive island（2014-04） [DOI] [Web of Scientce]
• Demonstration of 6-bit, 0.20-mV(pp) Quasi-Triangle Voltage Waveform Generator Based on Pulse-Frequency Modulation（2014-03） [DOI] [Web of Scientce]
• Precision improvement of the current multiplier based on the quantum current-mirror effect（2014-02） [DOI] [Web of Scientce]
• Design and operation of 6-bit, 0.25-mV(pp) quasi-sine voltage waveform generator based on SFQ pulse-frequency modulation（2014） [DOI] [Web of Scientce]
• Zero-crossing Shapiro step generated in a niobium in-line Josephson gate（2014） [DOI] [Web of Scientce]
• Polarity Reversal of Tunnel Magnetoresistance Observed in Lateral Co-Al-Co Single-Electron Transistor（2014）
• 5-Bit Quasi-Sinusoidal Voltage Waveform Synthesized Using Single-Flux-Quantum Pulse-Frequency Modulation（2013-06） [DOI] [Web of Scientce]
• Bias-voltage dependence of magnetoresistance enhancement in a single-electron transistor comprising two cobalt leads and an aluminum island（2013-04） [DOI] [Web of Scientce]
• Design and operation of 1000-fold voltage multiplier based on double-flux-quantum amplifier（2013） [DOI] [Web of Scientce]
• Effect of charging energy on critical current of dc-SQUID comprising two sub-micron aluminum Josephson junctions（2013-01） [DOI] [Web of Scientce]
• Current Multiplication Using Arrays of Small Josephson Junctions（2012-12） [DOI] [Web of Scientce]
• Drag Current Reversal in Capacitively Coupled Arrays of Small Josephson Junctions（2012-11） [DOI] [Web of Scientce]
• Estimation of Nb Junction Temperature Raised Due to Thermal Heat from Bias Resistor（2012-03） [DOI] [Web of Scientce]
• 強磁性リード電極を有する単一電子トランジスタでの磁気抵抗比増大効果の観測（2010）
• ホットエレクトロン効果を考慮した微小トンネル接合二次元アレーの微分コンダクタンス特性（2009-09） [CiNii Research (CiNii Articles)] [CiNii Books] [Othres link]
• Differential conductance characteristic of two dimensional tunnel junctions array considered hot electron effects（2009-09） [CiNii Research (CiNii Articles)] [CiNii Books] [Othres link]
• Electric Characteristics of Li2O-Doped TiO2 Nanocrystalline Film and Its Application to Dye-Sensitized Solar Cells（2009-02） [DOI] [Web of Scientce]
• Current Doublers Based on the Quantum Current-Mirror Effect（2008-10） [DOI] [Web of Scientce]
• Single-Electron Devices With Input Discretizer（2008-09） [DOI] [Web of Scientce]
• Tunnel magnetoresistance in ferromagnet-superconductor-ferromagnet single-electron transistors with different lead Spacings up to 50 mu m（2007-10） [DOI] [Web of Scientce]
• Current correlation in single-electron current mirror electromagnetically dual to Josephson voltage mirror（2007-09） [DOI] [Web of Scientce]
• Current Multiplication Based on the Quantum Current-Mirror Effect（2007-07）
• Optimization of asymmetric single-electron transistor generating ac-induced dc current（2007-06） [DOI] [Web of Scientce]
• Coulomb blockade conditions for detailed model of single-electron turnstile device including finite self-capacitances of island electrodes（2007-05） [DOI] [Web of Scientce]
• Monte Carlo study of charge transport in slantingly coupled arrays of small tunnel junctions（2005-03） [DOI] [Web of Scientce]
• Driving the single-electron device with a magnetic field (invited)（2003-05） [DOI] [Web of Scientce]
• Ferromagnetic Single-Electron Pump（2002-03）
• Magnetic-field-driven single-electron pump（2001-12） [DOI] [Web of Scientce]
• Current mirror effect and correlated cooper-pair transport in coupled arrays of small Josephson junctions（2000-10） [Web of Scientce]
• Quantum charge fluctuations in quantum dots（2000-03） [Web of Scientce]
• Spin polarization and magneto-Coulomb oscillations in ferromagnetic single electron devices（1998-08） [Web of Scientce]
• Magneto-Coulomb oscillation in ferromagnetic single electron transistors（1998-04） [Web of Scientce]
• Ferromagnetic single electron transistor（1998） [DOI]
• Enhanced magnetic valve effect and magneto-Coulomb oscillations in ferromagnetic single electron transistor（1997-05） [Web of Scientce]
• Magnetoresistance of Ni/NiO/Co Small Tunnel Junctions in Coulomb Blockade Regime（1996） [DOI]
• A new fabrication method for ultra small tunnel junctions（1996） [DOI]
• One-day dilution refrigerator（1993-09） [DOI]
• DYNAMICS OF HOT-ELECTRONS ACCUMULATED IN THE VELOCITY SPACE OF CDS WITH ACOUSTIC-PHONON INTERACTIONS（1993-09） [Web of Scientce]
• Nonlinear Optical Phenomena in Cyclotron Resonance of Positive Holes and Electrons in Cu2O（1991-11） [DOI]
• Hall Mobility of Positive Holes in Cu2O（1989-05） [DOI]
• A Novel Spectral Photoconductivity of the Ca-Sr-Bi-Cu-O System Correlative with Superconductivity（1988-08）
• A Novel Spectral Photoconductivity of the Ba-Pb-Bi-O System Correlative with Superconductivity（1988-08）
• A Novel Spectral Photoconductivity of the La-Cu-O Correlative with Superconductivity（1987-09）
• A Novel Spectral Photoconductivity of the Y-Cu-O, Y-Ba-Cu-O Correlative with Superconductivity（1987-09）

Misc

• Fabrication of resistively-coupled single-electron device using an array of gold nanoparticles（2017-08） [DOI] [Web of Scientce] [Othres link]
• Gate-tuned negative differential resistance observed at room temperature in an array of gold nanoparticles（2017-04） [DOI] [Web of Scientce] [Othres link]
• Fabrication of single-electron devices using dispersed nanoparticles and fitting experimental results to values calculated based on percolation model（2016-08） [DOI] [Web of Scientce] [Othres link]
• Fabrication of high temperature capacitively-and resistively-coupled single electron transistors using gold nanoparticles（2016） [DOI] [Web of Scientce] [Othres link]
• Tunneling Magnetoresistance and Single Electron Charging Effect（1998-09-20） [DOI] [CiNii Research (CiNii Articles)]

Presentations

• 超伝導デバイスを用いたSiO2/Si界面を持つSiO2層のフォノン減衰長の測定（2024-09-19）
• 遠隔配置した微小ジョセフソン接合列間のフォトンを介した電流相関（2024-09-17）
• SiO2/Si基板上の超伝導デバイス間におけるフォノン伝播の研究（2023-09-22）
• 単一Cooper対トランジスタによるフォノンの高感度検出（2023-03-17）
• 希釈冷凍温度で動作するラテラル型過減衰Al/AlOx/Al接合の作製（2022-11-04）
• Sensitive phonon detection by use of a single Cooper-pair transistor（2022-10-24）
• Phonon Detection with a Supercurrent through a Single Cooper-pair Transistor（2022-08-22） [Othres link]
• Gate-controlled supercurrent in vertical ultra-short superconductor/MoS2/superconductor junctions（2022-08-22）
• Phonon detection using a single Cooper-pair transistor（2021-08-06）
• 原子層堆積法を援用した斜め蒸着法による単一電子素子の作製（2020-09-09）
• Study on the Cooper-pair transistor as a fast supercurrent switch（2020-09-09）
• フォノン照射による微小Josephson接合列の特性変化（2020-03）
• Applicability of small Josephson junction arrays as radiation detectors（2019-12-02） [Othres link]
• Application of the Cooper-pair transistor as a supercurrent switch for superconducting circuits（2019-11-20） [Othres link]
• Long Range Current Correlation for Adjacent Small Josephson Junction Devices（2019-11-20） [Othres link]
• 微小Josephson接合列の輻射検出器としての利用性の評価（2019-09-19）
• 微小Josephson接合列の輻射検出器としての利用性の評価（2019-08-09）
• The Lifting of Coulomb Blockade by Alternating Voltages in Small Josephson junctions with Electromagnetic Environment-based Renormalization Effects（2019-03-17）
• 強く容量結合した短い微小ジョセフソン接合列における電流誘引現象（2019-03-17）
• 原子層堆積法を援用した微小トンネル接合素子の形成装置の開発（2019-01-09）
• The radio-frequency response of linear arrays of mesoscopic Josephson junctions（2018-11-08）
• Correlation of currents in remote arrays of small Josephson junctions through the quasiparticle excitation（2018-11-08）
• 室温ALD法を援用した斜め蒸着法による微小トンネル接合の作製（2018-03-17）
• Excitons in capacitively coupled chains of small Josephson junctions（2017-11-14） [Othres link]
• Fabrication of Mesoscopic Tunnel Junctions by Use of In-situ Low-temperature Atomic Layer Deposition for Tunnel Barriers（2017-10-29） [Othres link]
• Fabrication of Mesoscopic Tunnel Junctions by Use of In-situ Low-temperatureAtomic Layer Deposition for Tunnel Barriers（2017-10-29） [Othres link]
• The radio-frequency response of linear arrays of mesoscopic Josephson junctions and its application（2017-08-10） [Othres link]
• Cooper-pair excitons and quasiparticle excitons in capacitively coupled chains of small Josephson junctions（2017-08-10） [Othres link]
• 容量結合した微小ジョセフソン接合列におけるトンネル伝導(2)（2017-03-17）
• 1次元微小Josephson接合列の高周波印加に伴う直流特性変化（2016-09-13）
• 微小Josephson接合列による超伝導単一電子トランジスタからの輻射検出（2016-09-13）
• 容量結合した微小ジョセフソン接合列におけるトンネル伝導（2016-09-13）
• Co/Al/Co単一電子トランジスタにおけるトンネル磁気抵抗の静電的制御（2015-09-16）
• Electrostatic control of tunnel-magnetoresistance polarity in ferromagnetic single-electron transistors（2015-09-11）
• Long Range Induction between Josephson Junction Arrays via Microwave Photon Emission and Absorption（2015-07-08）
• 微小Josephson接合列におけるBloch振動と電流プラトーの観測（2015-03-21）
• 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（2015-03-21）
• 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（2015-01-22）
• Manipulating Cooper pairs by using linear arrays of small Josephson junctions（2014-10-20）
• 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（2014-09-19）
• Ni/Al/Ni単一電子トランジスタにおけるトンネル磁気抵抗の静電的な極性制御（2014-09-19）
• 量子電流ミラー効果における電流誘引過程の非局所性（2014-09-09）
• Observation of Bloch oscillation and current plateaus in an array of small Josephson junctions embedded in dc-SQUID network（2013-12-02）
• Towards precise current multiplication by use of linear arrays of small Josephson junctions（2013-11-27）
• Observation of Bloch oscillation and current plateaus in an array of small Josephson junctions embedded in dc-SQUID network（2013-11-27）
• Current Induction Phenomena in Capacitively Coupled Linear Arrays of Small Josephson Junctions（2013-11-01）
• 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（2013-09-19）
• 量子電流ミラー効果に基づく微小電流の整数倍器（2013-09-19）
• 微小Josephson接合列におけるBloch振動と電流プラトー（2013-09-18）
• Current Induction Phenomena in Capacitively Coupled Linear Arrays of Small Josephson Junctions（2013-09-09）
• 微小Josephson接合列を用いた電流整数倍器の高精度化（2013-03-28）
• Al/AlOx/V Josephson接合を用いた単一Cooper対素子（2013-03-22）
• DC/SFQ変換器をSFQ入力に用いた1000倍電圧増倍回路の増倍率評価（2013-03）
• Current Induction Phenomena between arrays of small Josephson Junctions（2012-03）
• アンダーダンプ接合でのSFQ反射を利用する電圧増倍器の増倍率評価（2012-03）
• Current steps in a mesoscopic Josephson junction embedded in a Josephson-junction network（2012-03）
• 強く容量結合した微小Josephson接合列における電流誘引現象（2011-12）
• 4-Step Quasi-Sine Waveform Synthesizer Based on 3-Bit Variable Pulse Number Multiplier（2011-10）
• The Quantum Current Mirror Based 10-Time Current Multiplier（2011-09）
• Current Induction in Strongly Coupled Arrays of Small Josephson Junctions（2011-08）
• 10-Time Current Multiplier Based on the Quantum Current Mirror（2011-03）
• Li-doped TiO2ナノ結晶薄膜の電気的特性評価と色素増感太陽電池への応用（2008-09）
• 量子電流ミラー効果を用いた微小電流２倍器（2007-12）
• Precise dc-current duplication and multiplication with arrays of small Josephson junctions（2007-12）
• 交流電圧駆動された単一電子トランジスタでの直流電流生成と素子パラメータの最適化（2007-09）
• 量子電流ミラー効果に基づいた微小電流２倍器(II)（2007-09）
• 量子電流ミラー効果に基づいた微小電流２倍器（2007-03）
• 量子電流ミラー効果を用いた微小電流２倍器（2006-12）
• 単一電子トランジスタを用いた微小強磁性金属の物性研究（2006-12）
• 単一電子デバイスのクーロンブロッケイド領域設計法に関する研究（2006-12）
• 量子電流ミラー効果による電流２倍器の試作（2005-12）
• 単電子ターンスタイル素子の電流ミラー回路応用（2005-12）
• 量子電流ミラー効果と電流の計量標準（2004-12）
• 量子電流ミラー（鏡）効果と量子電流標準器（2003-12）
• Driving the single-electron device with a magnetic field（2003-05）

Books and Other Publications

Works

Research Projects

Media Coverage

Industrial Property Rights

Professional Memberships

• 応用物理学会
• Physical Society of Japan

Committee Memberships

Teaching Experience

• Advanced Superconducting Electronic Devices
• 振動・波動論
• 実践的先進機器分析
• 実践的先進機器分析

Social Contribution

Academic Contribution

• Physica Scripta