Fine electronic states of Dirac-electron systems studied by high-resolution ARPES
| Project/Area Number |
25287079
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| Research Category |
Grant-in-Aid for Scientific Research (B)
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| Allocation Type | Partial Multi-year Fund |
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| Section | 一般 |
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| Research Field |
Condensed matter physics II
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| Research Institution | Tohoku University |
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Principal Investigator |
Sato Takafumi 東北大学, 理学(系)研究科(研究院), 准教授 (10361065)
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| Project Period (FY) |
2013-04-01 – 2017-03-31
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| Project Status |
Completed (Fiscal Year 2016)
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| Budget Amount *help |
¥18,980,000 (Direct Cost: ¥14,600,000、Indirect Cost: ¥4,380,000)
Fiscal Year 2016: ¥2,860,000 (Direct Cost: ¥2,200,000、Indirect Cost: ¥660,000)
Fiscal Year 2015: ¥2,730,000 (Direct Cost: ¥2,100,000、Indirect Cost: ¥630,000)
Fiscal Year 2014: ¥6,110,000 (Direct Cost: ¥4,700,000、Indirect Cost: ¥1,410,000)
Fiscal Year 2013: ¥7,280,000 (Direct Cost: ¥5,600,000、Indirect Cost: ¥1,680,000)
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| Keywords | トポロジカル絶縁体 / 鉄系超伝導体 / ディラックコーン / スピン偏極 / フェルミ面 / 物性実験 |
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| Outline of Final Research Achievements |
We have developed high-resolution spin-resolved photoemission spectrometer to clarify the relationship between basic electronic states and origin of anomalous physical properties in Dirac electron systems, and have performed high-resolution angle-resolved photoemission spectroscopy (ARPES) studies on graphene-based materials, iron-based superconductors, and topological insulators/semimetals. We have succeeded in (i) controlling the band gap of graphene by surface adsorption, (ii) observing Dirac-cone band in the nematic phase of parent iron-based superconductors, (iii) controlling Dirac-fermion mass at the interface between ultrathin ferromagnet and Rashba metal, and (iv) discovering new types of topological semimetals. From these results, we have clarified close relationship among Dirac-cone electronic states, crystal symmetry, and origin of unconventional physical properties.
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Report
(5 results)
Research Products
(85 results)
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[Journal Article] Direct Observation of Nonequivalent Fermi-Arc States of Opposite Surfaces in Noncentrosymmetric Weyl Semimetal NbP2016
Author(s)
S. Souma, Z. Wang, H. Kotaka, T. Sato, K. Nakayama, Y. Tanaka, H. Kimizuka, T. Takahashi, K. Yamauchi, T. Oguchi, K. Segawa, Y. Ando
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Journal Title
Phys.l Rev. B
Volume: 93
Issue: 16
DOI
Related Report
Peer Reviewed / Int'l Joint Research / Acknowledgement Compliant
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[Journal Article] Evolution from incoherent to coherent electronic states and its implications to superconductivity in FeTe1-xSex2014
Author(s)
E. Ieki, K. Nakayama, Y. Miyata, T. Sato, H. Miao, N. Xu, X.-P. Wang, P. Zhang, T. Qian, P. Richard, Z.-J. Xu, J. S. Wen, G. D. Gu, H. Q. Luo, H.-H. Wen, H. Ding, and T. Takahashi
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Journal Title
Phys. Rev. B
Volume: 89
Issue: 14
DOI
Related Report
Peer Reviewed / Acknowledgement Compliant
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[Presentation] 久野雅人2016
Author(s)
鉄系超伝導体のK吸着効果：高分解能ARPES
Organizer
日本物理学会第７１回年次大会
Place of Presentation
東北学院大学 (宮城・仙台)
Year and Date
2016-03-19
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