2012 Fiscal Year Final Research Report
Time- and angle-resolved photoemission study of high-Tc cuprates
| Project/Area Number |
23740256
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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 II
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| Research Institution | The University of Tokyo |
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Principal Investigator |
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| Project Period (FY) |
2011 – 2012
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| Keywords | 超高速現象 / 高温超伝導体 / 光電子分光 / 超短パルスレーザー / トポロジカル絶 縁体 / 表面光電効果 / 非線形光学過程 |
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| Research Abstract |
A high-Tc copper-oxide superconductor is investigated by means of time- and angle-resolved photoemission spectroscopy. We observe that the transient changes in the spectra occur only below a characteristic kink binding energy, and that the superconducting gap is transiently filled in the momentum region near the gap node. The results indicate that the scattering rate between the quasiparticle-excitations and the boson mode relevant for the kink is transiently increased so that the spectral weight is redistributed near the node and fills the superconducting gap in the nodal region. We also find a phenomenon wherein the efficiency of photoemission is modified when the surface is driven into non-equilibrium. This observation provides insights into the mechanism of photoemission from surface.
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Research Products
(7 results)
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[Presentation] Transient Surface Photoemission Involving Nonlinear Surface Sheet Polarization Developed on the Doped Bi_2Se_3 Topological Insulator2013
Author(s)
Y. Ishida,H. Kanto, W. Malaeb, S. Watanabe, C.-T.Chen, A. Kikkawa, Y. Taguchi, Y. Tokura,S. Shin
Organizer
APS March Meeting 2013
Place of Presentation
Baltimore Convention Center,Maryland, USA.
Year and Date
20130300
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