Interplay between superconductivity and pseudogap state studied by STM/STS and time-resolved optical spectroscopy

• Project/Area Number: 19K03732
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Review Section: Basic Section 13030:Magnetism, superconductivity and strongly correlated systems-related
• Research Institution: Hokkaido University
• Principal Investigator: Oda Migaku 北海道大学, 理学研究院, 教授 (70204211)
• Co-Investigator(Kenkyū-buntansha): 戸田 泰則 北海道大学, 工学研究院, 教授 (00313106)
• Project Period (FY): 2019-04-01 – 2023-03-31
• Project Status: Completed (Fiscal Year 2022)
• Budget Amount: ¥4,290,000 (Direct Cost: ¥3,300,000、Indirect Cost: ¥990,000); Fiscal Year 2021: ¥910,000 (Direct Cost: ¥700,000、Indirect Cost: ¥210,000); Fiscal Year 2020: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000); Fiscal Year 2019: ¥2,340,000 (Direct Cost: ¥1,800,000、Indirect Cost: ¥540,000)
• Keywords: 銅酸化物高温超伝導 / STM/STS / ポンププローブ時間分解分 / 擬ギャップ / 電子系変調構造 / 反強磁性秩序 / ポンププローブ時間分解分光 / 高温超伝導 / 銅酸化物 / 強相関電子系 / 走査トンネル分光 / ポンプ・プローブ時間分解分光

Outline of Research at the Start

本研究では、銅酸化物高温超伝導体Bi2212で走査トンネル分光（STS）とポンププローブ時間分解分光（PPTS）を行い、実・時間空間の双方から“擬ギャップ（PG）を担う電子状態が高温超伝導の発現に関わっているか”の問題にアプローチする。STSでは、PGと超伝導ギャップに関係する電子系変調構造間の実空間相関を調べ、電子系変調の起源に関する知見を得ると共に、PG状態と超伝導に関係する電子状態間の相互作用の可能性を明らかにする。PPTSでは、高強度パルス光の照射により超伝導相とPG状態を局所的に破壊し、その後の回復過程における両者の時間相関を基にPGを担う電子状態と超伝導の発現との関わりを議論する。

Outline of Final Research Achievements

In this study, we performed scanning tunneling microscopy/spectroscopy and pump-probe time-resolved optical spectroscopy on single crystals of bismuth-based high-temperature cuprate superconductors, and examined the real-space correlation among three types of electronic modulations (d form factor density wave and checkerboard modulation in the antinodal region, which is responsible for pseudogap, quasiparticle interference modulation in the Fermi-arc region, which is responsible for superconductivity), and the time-space correlation between pseudogap state and superconductivity in their formation process. On the basis of the results obtained in this study, we have suggested that the origin of checkerboard modulation will be the pair density wave, and clarified that the antinodal electronic states responsible for the pseudogap will be involved in the occurence of high-temperature superconductivity.

Academic Significance and Societal Importance of the Research Achievements

銅酸化物高温超伝導体は、その発見当初から従来の超伝導発現機構とは異なる新しいメカニズムの可能性が指摘され、学術的に大きな注目を集めてきた。また、エネルギー産業への応用の可能性など、社会的な意義も大きい。本研究では、高温超伝導がクーパー対密度波や擬ギャップを伴ったｄ構造因子密度波という新奇な密度波状態と実空間の同一領域で共存していることに加え、このような電子状態が高温超伝導の発現に関わっている可能性が示された。これらの研究成果は高温超伝導のメカニズムの解明に繋がるものであり、このことが本研究の学術的意義と言える。

Research Products

• [Int'l Joint Research] Univ Zurich/Paul Scherrer Inst(スイス)
• [Int'l Joint Research] Chalmers Univ Technol/Uppsala Univ(スウェーデン)
• [Int'l Joint Research] European Synchrotron Radiat Facil/Univ Grenoble Alpes/Univ Toulouse(フランス)
• [Int'l Joint Research] Max Planck Inst Solid State Res/Karlsruher Inst Technol/Inst Kristallog(ドイツ)
• [Int'l Joint Research] Diamond Light Source(英国)
• [Int'l Joint Research]
• [Int'l Joint Research] Jozef Stefan Inst(スロベニア)
• [Int'l Joint Research] Univ Grenoble Alpes(フランス)
• [Int'l Joint Research] Univ Sherbrooke/Canadian Inst Adv Res(カナダ)
• [Int'l Joint Research] Brookhaven Natl Lab/Argonne Natl Lab/SLAC Natl Accelerator Lab, Stanford Univ(米国)
• [Int'l Joint Research] Univ Zurich/Paul Scherrer Inst(スイス)
• [Int'l Joint Research]
• [Int'l Joint Research] Paul Scherrer Inst/Univ Zurich(スイス)
• [Int'l Joint Research] Brookhaven Natl Lab/Oak Ridge Natl Lab/Florida State Univ(米国)
• [Int'l Joint Research] University College London/Diamond Light Source(英国)
• [Int'l Joint Research] Univ Grenoble Alpes/European Synchrotron Radiat Facil(フランス)
• [Int'l Joint Research] Chinese Acad Sci/ShanghaiTech Univ/Univ Chinese Acad Sci(中国)
• [Int'l Joint Research]
• [Int'l Joint Research] University at Zurich/Paul Scherrer Institute/EPFL(スイス)
• [Int'l Joint Research] Fudan University(中国)
• [Int'l Joint Research] Uppsala University/Chalmers University of Technology(スウェーデン)
• [Int'l Joint Research] European Synchrotron Radiation Facility(フランス)
• [Int'l Joint Research] Technical University of Denmark(デンマーク)
• [Int'l Joint Research]
• [Journal Article] Fate of charge order in overdoped La-based cuprates (2023)
  • Author(s): von Arx K.、Wang Qisi、Mustafi S.、Mazzone D. G.、Horio M.、Mukkattukavil D. John、Pomjakushina E.、Pyon S.、Takayama T.、Takagi H.、Kurosawa T.、Momono N.、Oda M.、Brookes N. B.、Betto D.、Zhang W.、Asmara T. C.、Tseng Y.、Schmitt T.、Sassa Y.、Chang J.
  • Journal Title: npj Quantum Materials Volume: 8 Issue: 1 Pages: 7-7
  • DOI: 10.1038/s41535-023-00539-w
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] Optical vortex induced spatio-temporally modulated superconductivity in a high-Tc cuprate (2023)
  • Author(s): Toda Yasunori、Tsuchiya Satoshi、Yamane Keisaku、Morita Ryuji、Oda Migaku、Kurosawa Tohru、Mertelj Tomaz、Mihailovic Dragan
  • Journal Title: Optics Express Volume: 31 Issue: 11 Pages: 17537-17537
  • DOI: 10.1364/oe.487041
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] Single-domain stripe order in a high-temperature superconductor (2022)
  • Author(s): Simutis Gediminas、Kuspert Julia、Wang Qisi、Choi Jaewon、Bucher Damian、Boehm Martin、Bourdarot Frederic、Bertelsen Mads、Wang Chennan N、Kurosawa Tohru、Momono Naoki、Oda Migaku、M?nsson Martin、Sassa Yasmine、Janoschek Marc、Christensen Niels B.、Chang Johan、Mazzone Daniel G.
  • Journal Title: Communications Physics Volume: 5 Issue: 1 Pages: 296-296
  • DOI: 10.1038/s42005-022-01061-4
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] Pseudogap suppression by competition with superconductivity in La-based cuprates (2022)
  • Author(s): Kuspert J.、Cohn Wagner R.、Lin C.、von Arx K.、Wang Q.、Kramer K.、Pudelko W. R.、Plumb N. C.、Matt C. E.、Fatuzzo C. G.、Sutter D.、Sassa Y.、Yan J.-Q.、Zhou J.-S.、Goodenough J. B.、Pyon S.、Takayama T.、Takagi H.、Kurosawa T.、Momono N.、Oda M.、Hoesch M.、Cacho C.、Kim T. K.、Horio M.、Chang J.
  • Journal Title: Physical Review Research Volume: 4 Issue: 4 Pages: 043015-9
  • DOI: 10.1103/physrevresearch.4.043015
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] Competition between spin ordering and superconductivity near the pseudogap boundary in La2-xSrxCuO4: Insights from NMR (2022)
  • Author(s): Vinograd I.、Zhou R.、Mayaffre H.、Kramer S.、Ramakrishna S. K.、Reyes A. P.、Kurosawa T.、Momono N.、Oda M.、Komiya S.、Ono S.、Horio M.、Chang J.、Julien M.-H.
  • Journal Title: Physical Review B Volume: 106 Issue: 5 Pages: 054522-054522
  • DOI: 10.1103/physrevb.106.054522
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] Evidence for a Square-Square Vortex Lattice Transition in a High-Tc Cuprate Superconductor (2022)
  • Author(s): Campbell D.J.、Frachet M.、Benhabib S.、Gilmutdinov I.、Proust C.、Kurosawa T.、Momono N.、Oda M.、Horio M.、Kramer K.、Chang J.、Ichioka M.、LeBoeuf D.
  • Journal Title: Physical Review Letters Volume: 129 Issue: 6 Pages: 067001-067001
  • DOI: 10.1103/physrevlett.129.067001
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] Crystal symmetry of stripe-ordered La1.88Sr0.12CuO4 (2022)
  • Author(s): Frison R.、Kuspert J.、Wang Qisi、Ivashko O.、Zimmermann M. v.、Meven M.、Bucher D.、Larsen J.、Niedermayer Ch.、Janoschek M.、Kurosawa T.、Momono N.、Oda M.、Christensen N. B.、Chang J.
  • Journal Title: Physical Review B Volume: 105 Issue: 22 Pages: 224113-224113
  • DOI: 10.1103/physrevb.105.224113
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] Unveiling Unequivocal Charge Stripe Order in a Prototypical Cuprate Superconductor (2022)
  • Author(s): Choi J.、Wang Q.、Joehr S.、Christensen N. B.、Kuspert J.、Bucher D.、Biscette D.、Fischer M. H.、Hucker M.、Kurosawa T.、Momono N.、Oda M.、Ivashko O.、Zimmermann M. v.、Janoschek M.、Chang J.
  • Journal Title: Physical Review Letters Volume: 128 Issue: 20 Pages: 207002-207002
  • DOI: 10.1103/physrevlett.128.207002
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] Uniaxial pressure induced stripe order rotation in La1.88Sr0.12CuO4 (2022)
  • Author(s): Wang Qisi、von Arx K.、Mazzone D. G.、Mustafi S.、Horio M.、K?spert J.、Choi J.、Bucher D.、Wo H.、Zhao J.、Zhang W.、Asmara T. C.、Sassa Y.、M?nsson M.、Christensen N. B.、Janoschek M.、Kurosawa T.、Momono N.、Oda M.、Fischer M. H.、Schmitt T.、Chang J.
  • Journal Title: Nature Communications Volume: 13 Issue: 1 Pages: 1795-1795
  • DOI: 10.1038/s41467-022-29465-4
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] Ultrafast transient reflectivity measurements of optimally doped Bi2+xSr2-xCaCu2O8+delta with disorder (2021)
  • Author(s): Toda Y.、Tsuchiya S.、Oda M.、Kurosawa T.、Katsumata S.、Naseska M.、Mertelj T.、Mihailovic D.
  • Journal Title: Physical Review B Volume: 104 Issue: 9 Pages: 094507-094507
  • DOI: 10.1103/physrevb.104.094507
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] Normal state specific heat in the cuprate superconductors La2-xSrxCuO4 and Bi2+ySr2-x-yLaxCuO6+delta near the critical point of the pseudogap phase (2021)
  • Author(s): Girod C.、LeBoeuf D.、Demuer A.、Seyfarth G.、Imajo S.、Kindo K.、Kohama Y.、Lizaire M.、Legros A.、Gourgout A.、Takagi H.、Kurosawa T.、Oda M.、Momono N.、Chang J.、Ono S.、Zheng G.-q.、Marcenat C.、Taillefer L.、Klein T.
  • Journal Title: Physical Review B Volume: 103 Issue: 21 Pages: 214506-214506
  • DOI: 10.1103/physrevb.103.214506
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] Magnetic Properties of S = 1/2 Distorted Kagome Antiferromagnet CdCu3(OH)6Cl2 with Low-Symmetry Orbital Arrangement (2021)
  • Author(s): Yoshida Hiroyuki K.、Noguchi Naoya、Ishii Yuto、Oda Migaku、Chen Jie、Yamaura Kazunari、Yamashita Satoshi、Nakazawa Yasuhiro、Kida Takanori、Narumi Yasuo、Hagiwara Masayuki
  • Journal Title: Journal of the Physical Society of Japan Volume: 90 Issue: 4 Pages: 044714-044714
  • DOI: 10.7566/jpsj.90.044714
  • NAID: 40022540074
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] Field-induced successive phase transitions in the J1?J2 buckled honeycomb antiferromagnet Cs3Fe2Cl9 (2021)
  • Author(s): Ishii Y.、Narumi Y.、Matsushita Y.、Oda M.、Kida T.、Hagiwara M.、Yoshida H. K.
  • Journal Title: Physical Review B Volume: 103 Issue: 10 Pages: 104433-104433
  • DOI: 10.1103/physrevb.103.104433
  • Peer Reviewed
• [Journal Article] Charge density waves in cuprate superconductors beyond the critical doping (2021)
  • Author(s): Miao H.、Fabbris G.、Koch R. J.、Mazzone D. G.、Nelson C. S.、Acevedo-Esteves R.、Gu G. D.、Li Y.、Yilimaz T.、Kaznatcheev K.、Vescovo E.、Oda M.、Kurosawa T.、Momono N.、Assefa T.、Robinson I. K.、Bozin E. S.、Tranquada J. M.、Johnson P. D.、Dean M. P. M.
  • Journal Title: npj Quantum Materials Volume: 6 Issue: 1 Pages: 31-31
  • DOI: 10.1038/s41535-021-00327-4
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] Coexistence of checkerboard and quasiparticle interference modulations in Bi2Sr2CaCu2O8+x studied by scanning tunneling microscopy/spectroscopy (2020)
  • Author(s): Mizuta Shusei, Oda Migaku, Momono Naoki, Yoshida Hiroyuki K., Ido Masayuki
  • Journal Title: Physical Review B Volume: 102 Issue: 18
  • DOI: 10.1103/physrevb.102.184513
  • Peer Reviewed
• [Journal Article] Impurity Effects on Superconductivity of LaO1-xFxBi1-ySbyS2 through Specific Heat Measurements (2020)
  • Author(s): Wang Ying, Takahashi Shotaro, Suda Takaya, Tamura Taro, Ohta Haruka, Kurosawa Tohru, Oda Migaku, Ido Masayuki, Momono Naoki
  • Journal Title: Journal of the Physical Society of Japan Volume: 89 Issue: 9 Pages: 094708-094708
  • DOI: 10.7566/jpsj.89.094708
  • Peer Reviewed
• [Journal Article] High-pressure synthesis, crystal structure, and magnetic properties of the Shastry-Sutherland-lattice oxides BaLn2ZnO5 (Ln = Pr, Sm, Eu) (2020)
  • Author(s): Ishii Yuto, Chen Jie, Yoshida Hiroyuki K., Oda Migaku, Christianson Andrew D., Yamaura Kazunari
  • Journal Title: Journal of Solid State Chemistry Volume: 289 Pages: 121489-121489
  • DOI: 10.1016/j.jssc.2020.121489
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] Hidden magnetism at the pseudogap critical point of a cuprate superconductor (2020)
  • Author(s): Frachet Mehdi, Vinograd Igor, Zhou Rui, Benhabib Siham, Wu Shangfei, Mayaffre Hadrien, Krmer Steffen, Ramakrishna Sanath K., Reyes Arneil P., Debray Jrme, Kurosawa Tohru, Momono Naoki, Oda Migaku, Komiya Seiki, Ono Shimpei, Horio Masafumi, Chang Johan, Proust Cyril, LeBoeuf David, Julien Marc-Henri
  • Journal Title: Nature Physics Volume: 16 Issue: 10 Pages: 1064-1068
  • DOI: 10.1038/s41567-020-0950-5
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] q=0 long-range magnetic order in centennialite CaCu3(OD)6Cl2・0.6D2O: A spin-1/2 perfect kagome antiferromagnet with J1-J2-Jd; (2020)
  • Author(s): K. Iida, H. K. Yoshida, A. Nakao, H. O. Jeschke, Y. Iqbal, K. Nakajima, S. Ohira-Kawamura, K. Munakata, Y. Inamura, N. Murai, M. Ishikado, R. Kumai, T. Okada, M. Oda, K. Kakurai, and M. Matsuda
  • Journal Title: Phys. Rev. B Volume: 101 Issue: 22 Pages: 220408-220408
  • DOI: 10.1103/physrevb.101.220408
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] Strongly Correlated Charge Density Wave in La2-xSrxCuO4 Evidenced by Doping-Dependent Phonon Anomaly (2020)
  • Author(s): Lin J. Q., Miao H., Mazzone D. G., Gu G. D., Nag A., Walters A. C., Garca-Fernndez M., Marbour A., Pelliciari J., Jarrige I., Oda M., Kurosawa K., Momono N., Zhou Ke-Jin, Bisogni V., Liu X., Dean M. P. M.
  • Journal Title: Physical Review Letters Volume: 124 Issue: 20
  • DOI: 10.1103/physrevlett.124.207005
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] High-Temperature Charge-Stripe Correlations in La1.675Eu0.2Sr0.125CuO4 (2020)
  • Author(s): Wang Qisi et al.
  • Journal Title: Physical Review Letters Volume: 124 Issue: 18 Pages: 187002-187002
  • DOI: 10.1103/physrevlett.124.187002
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] Thermal-transport studies of kagome antiferromagnets (2020)
  • Author(s): M. Yamashita, M. Akazawa, M. Shimozawa, T. Shibauchi, Y. Matsuda, H. Ishikawa, T. Yajima, Z. Hiroi, M. Oda, H. Yoshida, H.-Y. Lee, J. H. Han and N. Kawashima
  • Journal Title: Journal of Physics: Condensed Matter Volume: 32 Issue: 7 Pages: 074001-074001
  • DOI: 10.1088/1361-648x/ab50e9
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] High-Temperature Charge-Stripe Correlations in La1.675Eu0.2Sr0.125CuO4 (2020)
  • Author(s): Q. Wang, M. Horio, K. von Arx, Y. Shen, D. Mukkattukavil, Y. Sassa, O. Ivashko, C. E. Matt, S. Pyon, T. Takayama, H. Takagi, T. Kurosawa, N. Momono, M. Oda, T. Adachi, S. M. Haidar, Y. Koike, Y. Tseng, W. Zhang, J. Zhao, K. Kummer
  • Journal Title: Physical Review Letter Volume: －
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] Anomalous Transport Properties in BiS2-based Superconductors Ln1-xFxBiS2 (Ln = Nd, La, Sm) (2019)
  • Author(s): Iwasaki Sho、Kawai Yoshiki、Takahashi Shotaro、Suda Takaya、Wang Ying、Koshino Yasunori、Ogura Fumiya、Shibayama Yoshiyuki、Kurosawa Tohru、Oda Migaku、Ido Masayuki、Momono Naoki
  • Journal Title: Journal of the Physical Society of Japan Volume: 88 Issue: 4 Pages: 041005-041005
  • DOI: 10.7566/jpsj.88.041005
  • Peer Reviewed
• [Presentation] 少量の過剰酸素が添加されたLa系銅酸化物の電気伝導と磁気秩序の関わり (2023)
  • Author(s): 宮腰宏太, 城剛希, 岩松柾希, 衣川裕也, 水田崇聖, 井原慶彦, 吉田紘行, 戸田泰則, 黒澤徹, 桃野直樹, 小田研
  • Organizer: 日本物理学会2023年春季大会
• [Presentation] 少量の過剰酸素が添加された La 系銅酸化物の磁場中における 超伝導および超伝導揺らぎ (2023)
  • Author(s): 岩松柾希, 宮腰宏太, 城剛希, 衣川裕也, 水田崇聖, 井原慶彦, 吉田紘行, 戸田泰則, 黒澤徹, 桃野直樹, 小田研
  • Organizer: 日本物理学会2023年春季大会
• [Presentation] Effects of magnetic order on electronic conduction in high-Tc cuprate La2CuO4+d (2022)
  • Author(s): K. Miyakoshi, M. Iwamatsu, K. Tachi, Y. Kinugawa, S. Mizuta, Y. Ihara, H. Yoshida, Y. Toda, T. Kurosawa, N. Momono, and M. Oda
  • Organizer: International workshop on Microscopic Properties of Quantum Materials
  • Int'l Joint Research
• [Presentation] La-NQR測定による過剰酸素La2CuO4+yにおいて実現する超伝導―反強磁性共存状態の微視的研究 (2022)
  • Author(s): 井原慶彦, 衣川裕也, 小田研
  • Organizer: 日本物理学会 第77回年次大会
• [Presentation] 銅酸化物高温超伝導体におけるチェッカーボード変調と準粒子干渉との実空間相関 (2020)
  • Author(s): 小田 研, 水田 崇聖, 黒澤 徹, 吉田 紘行, 伊土 政幸, 桃野 直樹, 戸田 泰則
  • Organizer: つくば-柏-本郷 超伝導かけはしプロジェクト・ワークショップ
• [Presentation] STM/STSからみたBi2212の電子系変調構造とエネルギーギャップ (2020)
  • Author(s): 水田 崇聖, 黒澤 徹, 吉田 紘行, 小田 研, 伊土 政幸, 桃野 直樹
  • Organizer: 日本物理学会 第75回年次大会
• [Presentation] Coexistence of electronic superstructures in high-Tc cuprate Bi2Sr2CaCu2O8+x studied by STM/STS (2019)
  • Author(s): S. Mizuta, T. Kurosawa, N. Momono, H. Yoshida, M. Oda and M. Ido
  • Organizer: SNS (spectroscopies in Novel Superconductors) 2019
  • Int'l Joint Research
• [Presentation] STM/STS Study on Coexistence of Electronic Superstructures in Cuprate Superconductor Bi2Sr2CaCu2O8+x (2019)
  • Author(s): S. Mizuta, T. Kurosawa, N. Momono, H. Yoshida, M. Oda and M. Ido
  • Organizer: 5th ISCPMS (International Symposium on Current Progress in Mathematics and Sciences)
  • Int'l Joint Research
• [Presentation] 銅酸化物高温超伝導体Bi2212の超伝導ギャップと一次元超格子との相関 (2019)
  • Author(s): 小田 研, 水田 崇聖, 黒澤 徹, 吉田 紘行, 伊土 政幸, 桃野 直樹, 戸田 泰則
  • Organizer: つくば-柏-本郷 超伝導かけはしプロジェクト・ワークショップ
• [Presentation] STM/STS imaging of electronic superstructures in high-Tc cuprate Bi2212 (2019)
  • Author(s): M. Oda, S. Mizuta, T. Kurosawa, H. Yoshida, M. Ido, N. Momono and Y. Toda
  • Organizer: Superstripes 2019 International Conference
  • Int'l Joint Research / Invited
• [Presentation] STM imaging of electronic superstructures in high-Tc cuprate Bi2Sr2CaCu2O8+d (2019)
  • Author(s): M. Oda, S. Mizuta, T. Kurosawa, H. Yoshida, M. Ido, N. Momono and Y. Toda
  • Organizer: ECSN2019 International Conference
  • Int'l Joint Research / Invited