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  Time-resolved Boson Emission in the Excitation Spectrum of Bi2Sr2CaCu2O8+δ

Rameau, J. D., Freutel, S., Sentef, M. A., Kemper, A. F., Freericks, J. K., Avigo, I., et al. (in preparation). Time-resolved Boson Emission in the Excitation Spectrum of Bi2Sr2CaCu2O8+δ.

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Item Permalink: http://hdl.handle.net/11858/00-001M-0000-0028-4EB1-C Version Permalink: http://hdl.handle.net/11858/00-001M-0000-0028-4EB2-A
Genre: Paper

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1505.07055.pdf (Preprint), 216KB
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http://arxiv.org/abs/1505.07055 (Preprint)
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 Creators:
Rameau, J. D.1, Author
Freutel, S.2, Author
Sentef, Michael A.3, 4, 5, Author              
Kemper, A. F.6, Author
Freericks, J. K.7, Author
Avigo, I.2, Author
Ligges, M.2, Author
Rettig, L.2, Author
Yoshida, Y.8, Author
Eisaki, H.8, Author
Schneeloch, J.1, Author
Zhong, R. D.1, Author
Xu, Z. J.1, Author
Gu, G. D.1, Author
Johnson, P. D.1, Author
Bovensiepen, U.2, Author
Affiliations:
1Brookhaven National Laboratory, Upton, New York, 11973, USA, ou_persistent22              
2Fakultät Für Physik und Zentrum für Nanointegration Duisburg-Essen, Universität Duisburg-Essen, Lotharstrasse 1, 47057 Duisburg, Germany, ou_persistent22              
3Theory Department, Max Planck Institute for the Structure and Dynamics of Matter, Max Planck Society, ou_2074320              
4Center for Free Electron Laser Science, 22761 Hamburg, Germany, ou_persistent22              
5HISKP, University of Bonn, 53115 Bonn, Germany, ou_persistent22              
6Lawrence Berkeley National Laboratory, 1 Cyclotron Road, Berkeley, CA 94720, USA, ou_persistent22              
7Department of Physics, Georgetown University, Washington, DC 20057, USA, ou_persistent22              
8National Institute of Advanced Industrial Science and Technology, Tsukuba, Ibaraki 305-8568, Japan, ou_persistent22              

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Free keywords: Condensed Matter; Strongly Correlated Electrons; Superconductivity
 Abstract: Using femtosecond time- and angle-resolved photoemission spectroscopy we analyze the complex unoccupied electronic structure of optimally doped Bi2Sr2CaCu2O8+δ after optical excitation. Electronic relaxation is characterized by a 250 fs relaxation time below and <20 fs above a single boson energy of ~75 meV above the Fermi energy EF which represents the unoccupied counterpart of the kink observed below EF and Tc. With increasing optical excitation density this sharp energy-dependent step in the relaxation time is found to vanish, in good agreement with self-energy and time-dependent Keldysh Green's function calculations, due to redistribution of electrons within the relaxation phase space. These findings have implications regarding the origin of the primary nodal kink in the electronic structure and for the mechanism behind high Tc superconductivity in the cuprates.

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Language(s): eng - English
 Dates: 2015-05-26
 Publication Status: Not specified
 Pages: 5
 Publishing info: -
 Table of Contents: -
 Rev. Method: No review
 Identifiers: arXiv: 1505.07055
 Degree: -

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