Investigation of electronic structures and new functions in materials with spin-momentum locking

• Project/Area Number: 15H03683
• Research Category: Grant-in-Aid for Scientific Research (B)
• Allocation Type: Single-year Grants
• Section: 一般
• Research Field: Condensed matter physics II
• Research Institution: The University of Tokyo
• Principal Investigator: Ishizaka Kyoko 東京大学, 大学院工学系研究科(工学部), 教授 (20376651)
• Project Period (FY): 2015-04-01 – 2018-03-31
• Project Status: Completed (Fiscal Year 2017)
• Budget Amount: ¥17,160,000 (Direct Cost: ¥13,200,000、Indirect Cost: ¥3,960,000); Fiscal Year 2017: ¥3,250,000 (Direct Cost: ¥2,500,000、Indirect Cost: ¥750,000); Fiscal Year 2016: ¥5,590,000 (Direct Cost: ¥4,300,000、Indirect Cost: ¥1,290,000); Fiscal Year 2015: ¥8,320,000 (Direct Cost: ¥6,400,000、Indirect Cost: ¥1,920,000)
• Keywords: スピン軌道相互作用 / トポロジカル物質 / 光電子分光 / トポロジカル表面状態 / 電荷密度波 / 物性実験 / ワイル半金属 / 超伝導

Outline of Final Research Achievements

There has been increasing interest in the spin-orbit interaction of electrons in solids, that plays an essential role on realizing a variety of topological materials and spintronic functions. In this study, we investigated the electronic structures and the roles of spin-orbit interactions in various superconductors and topological semimetal candidate, by utilizing the spin- and angle-resolved photoemission spectroscopy that can directly obtain the information on energy, momentum, and spin of electrons.

Research Products

• [Journal Article] Orbital-anisotropic electronic structure in the nonmagnetic state of BaFe2(As1-xPx)2 superconductors (2018)
  • Author(s): 1.T. Sonobe, T. Shimojima, A. Nakamura, M. Nakajima, S.Uchida, K. Kihou, C.H. Lee, A. Iyo, H. Eisaki, K. Ohgushi, K. Ishizaka
  • Journal Title: Sci. Rep. Volume: 8 Issue: 1 Pages: 2169-2169
  • DOI: 10.1038/s41598-018-20332-1
  • Peer Reviewed / Open Access
• [Journal Article] Antiferroic electronic structure in the nonmagnetic superconducting state of the iron-based superconductors (2017)
  • Author(s): Shimojima Takahiro、Malaeb Walid、Nakamura Asuka、Kondo Takeshi、Kihou Kunihiro、Lee Chul-Ho、Iyo Akira、Eisaki Hiroshi、Ishida Shigeyuki、Nakajima Masamichi、Uchida Shin-ichi、Ohgushi Kenya、Ishizaka Kyoko、Shin Shik
  • Journal Title: Science Advances Volume: 3 Issue: 8
  • DOI: 10.1126/sciadv.1700466
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] Observation of spin-polarized bands and domain-dependent Fermi arcs in polar Weyl semimetal MoTe2 (2017)
  • Author(s): M. Sakano,M. S. Bahramy, H. Tsuji, Araya, K. Ikeura, H. Sakai, S. Ishiwata, K. Yaji, K. Kuroda, A. Harasawa, S. Shin, and K. Ishizaka
  • Journal Title: Phys. Rev. B Volume: 95 Issue: 12
  • DOI: 10.1103/physrevb.95.121101
  • Peer Reviewed / Open Access / Int'l Joint Research / Acknowledgement Compliant
• [Journal Article] Multiple-pseudogap phases in the hydrogen-doped LaFeAsO system (2017)
  • Author(s): A. Nakamura, T. Shimojima, T. Sonobe, S. Yoshida, K. Ishizaka, W. Malaeb, S. Shin, S. Iimura, S. Matsuishi, and H. Hosono
  • Journal Title: Phys. Rev. B Volume: 95 Issue: 6
  • DOI: 10.1103/physrevb.95.064501
  • Peer Reviewed / Int'l Joint Research / Acknowledgement Compliant
• [Journal Article] Electron and lattice dynamics of transition metal thin films observed by ultrafast electron diffraction and transient optical measurements (2016)
  • Author(s): A.Nakamura, T. Shimojima, M. Nakano, Y. Iwasa, and K. Ishizaka
  • Journal Title: Struct, Dyn. Volume: 3 Issue: 6
  • DOI: 10.1063/1.4971210
  • Peer Reviewed / Int'l Joint Research / Acknowledgement Compliant
• [Journal Article] Topologically protected surface states in a centrosymmetric superconductor β-PdBi_2 (2015)
  • Author(s): M. Sakano, K. Okawa, K. Kanou, H. Sanjo, T. Okuda, T. Sasagawa, K. Ishizaka
  • Journal Title: Nature Communications Volume: 6 Issue: 1
  • DOI: 10.1038/ncomms9595
  • Peer Reviewed / Open Access / Int'l Joint Research / Acknowledgement Compliant
• [Journal Article] Momentum-Dependent Sign Inversion of Orbital Order in Superconducting FeSe (2015)
  • Author(s): Y. Suzuki, T. Shimojima, T. Sonobe, A. Nakamura, M. Sakano, H. Tsuji, J. Omachi, K. Yoshioka, M. Kuwata-Gonokami, T. Watashige, R. Kobayashi, S. Kasahara, T. Shibauchi, Y. Matsuda, Y. Yamakawa, H. Kontani, and K. Ishizaka
  • Journal Title: Phys. Rev. B Volume: 92 Issue: 20 Pages: 205117-205117
  • DOI: 10.1103/physrevb.92.205117
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] Nonequilibrium electronic and phonon dynamics of Cu0.17Bi2Se3 investigated by core-level and valence-band time-resolved photoemission spectroscopy (2015)
  • Author(s): T. Yamamoto, Y. Ishida, R. Yoshida, M. Okawa, K. Okazaki, T. Kanai, A. Kikkawa, Y. Taguchi, T. Kiss, K. Ishizaka, N. Ishii, J. Itatani, S. Watanabe, Y. Tokura, T. Saitoh, and S. Shin
  • Journal Title: Phys. Rev. B Volume: 92 Issue: 12
  • DOI: 10.1103/physrevb.92.121106
  • Peer Reviewed / Int'l Joint Research / Acknowledgement Compliant
• [Presentation] α-PdBi2におけるトポロジカル表面バンド構造の観測 (2018)
  • Author(s): 久保田祐貴、坂野昌人、大川顕次郎、角田一樹、E. F. Schwier、奥田太一、島田賢也、笹川崇男、石坂香子
  • Organizer: 日本物理学会第73回年次大会
• [Presentation] 二重ジグザグ鎖形状の格子歪みをもつ1T”-VTe2の電子状態 (2018)
  • Author(s): 三石夏樹, 杉田悠介, 上谷学, 園部竜也, 坂野昌人, 下志万貴博, M S Bahramy, 田口一暁, 宮本幸次, 奥田太一, 石渡晋太郎, 求幸年, 石坂香子
  • Organizer: 日本物理学会第73回年次大会
• [Presentation] 角度分解光電子分光と第一原理計算を用いた層状強磁性V1/3NbS2の電子構造の研究 (2018)
  • Author(s): 吉田訓, 松下雄一郎, 岩田潤一, 厳正輝, 坂野昌人, 下志万貴博, 堀場弘司, 小野寛太, 組頭広志, 長鶴徳彦, 高阪勇輔, 井上克也, 秋光純, 石坂香子
  • Organizer: 日本物理学会第73回年次大会
• [Presentation] Topological electronic structures in transition metal dichalcogenide (2017)
  • Author(s): Kyoko Ishizaka
  • Organizer: International Workshop on Strong Correlations and Angle-Resolved Photoemission Spectroscopy (CORPES17)
  • Int'l Joint Research / Invited
• [Presentation] Pseudogaps and symmetry-broken electronic states in iron-pnictide superconductors (2017)
  • Author(s): Kyoko Ishizaka
  • Organizer: Korean Physical Society meeting, Pioneer symposium: Pseudo-gaps in High Tc Superconductors
  • Int'l Joint Research / Invited
• [Presentation] トポロジカルな金属/半金属におけるバルクと表面の電子構造 (2017)
  • Author(s): 石坂香子
  • Organizer: 物性研究所短期研究会「 光で 見る・操る 電子物性科学の最前線 ～強相関, トポロジー, 低次元, ダイナミクス～」
  • Invited
• [Presentation] Electronic structure of noncentrosymmetric semimetal MoTe2 (2016)
  • Author(s): Kyoko Ishizaka
  • Organizer: 14th Bilateral Jpn.-Ger. Symposium
  • Place of Presentation: 北海道札幌市ガトーキングダムサッポロ
  • Year and Date: 2016-09-24
  • Int'l Joint Research / Invited
• [Presentation] 超伝導体β-PdBi2におけるトポロジカル表面状態の観測 (2016)
  • Author(s): 坂野昌人
  • Organizer: 日本物理学会
  • Place of Presentation: 石川県金沢市金沢大学
  • Year and Date: 2016-09-13
  • Invited
• [Presentation] 遷移金属ダイカルコゲナイドβ-MoTe2の極性構造相転移における電子構造変化 (2016)
  • Author(s): 新谷慈, 辻英徳, 池浦晃至, 下志万貴博, 酒井英明A, 石渡晋太郎, M.S. Bahramy, 石坂香子
  • Organizer: 日本物理学会
  • Place of Presentation: 石川県金沢市金沢大学
  • Year and Date: 2016-09-13
• [Presentation] Electronic structures of non-centrosymmetric compounds with spin-orbit coupling (2016)
  • Author(s): Kyoko Ishizaka
  • Organizer: Workshop on Engineering Quantum Matter: From Understanding to Control (EQM2016)
  • Place of Presentation: The Byre Theatre, St. Andrews, Scotland
  • Year and Date: 2016-06-08
  • Int'l Joint Research / Invited
• [Presentation] Observation of Topologically Protected Surface States in b-PdBi2 Superconductor (2015)
  • Author(s): Kyoko Ishizaka
  • Organizer: 28th International Symposium on Superconductivity (ISS2015)
  • Place of Presentation: 東京都江戸川区タワーホール船堀
  • Year and Date: 2015-11-16
  • Int'l Joint Research / Invited
• [Presentation] Observation of huge spin splitting in non-centrosymmetric semiconductors (2015)
  • Author(s): Kyoko Ishizaka
  • Organizer: The 15th International Conference on the Formation of Semiconductor Interfaces (ICFSI-15)
  • Place of Presentation: 広島県広島市広島国際会議場
  • Year and Date: 2015-11-15
  • Int'l Joint Research / Invited
• [Presentation] Observation of valley-dependent spin-polarization in bulk 3R-MoS2 (2015)
  • Author(s): Kyoko Ishizaka
  • Organizer: International Conference on Materials for Advanced Technologies of the Materials Research Society of Singapore (ICMAT2015)
  • Place of Presentation: Suntec Singapore, Singapore
  • Year and Date: 2015-06-27
  • Int'l Joint Research / Invited
• [Presentation] Topologically protected surface states in a Pd-Bi superconductor (2015)
  • Author(s): M. Sakano, K. Okawa, M. Kanou, H. Sanjo, T. Okuda, T. Sasagawa, K. Ishizaka
  • Organizer: International Conference on Materials for Advanced Technologies of the Materials Research Society of Singapore (ICMAT2015)
  • Place of Presentation: Suntec Singapore, Singapore
  • Year and Date: 2015-06-27
  • Int'l Joint Research