2016 Fiscal Year Final Research Report
Nonequilibrated state of matter investigated via time-resolved photoemission
| Project/Area Number |
26800165
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| Research Category |
Grant-in-Aid for Young Scientists (B)
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| Allocation Type | Multi-year Fund |
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| Research Field |
Condensed matter physics I
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| Research Institution | The University of Tokyo |
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Principal Investigator |
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| Project Period (FY) |
2014-04-01 – 2017-03-31
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| Keywords | 時間分解光電子分光法 / トポロジカル絶縁体 / 光起電力 / スピン偏極電流 / 銅酸化物高温超伝導体 / ディラック電子系 |
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| Outline of Final Research Achievements |
A continuous development was pursued for a variety of pump-probe photoemission spectroscopic method and methodologies: (1) By revealing the band structures in the unoccupied side, a variety of topological states of matter (topological insulators, TIs, and Weyl semimetals) was identified. (2) Owing to the surface sensitivity of the method, we discovered the emergence of surface photovoltage on a series of bulk-insulating TIs, by which optical generation of spin-polarized surface current may become possible. (3) A new mechanism was proposed for the cuprate superconductivity after investigating the ultrafast responses of the electronic structures of Bi2212. 4. Ultrafast carrier dynamics of Dirac electrons were investigated, and the applicability of some models as well as the realization of an inverted population were discussed.
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| Free Research Field |
超高速ダイナミクス
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