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  How Circular Dichroism in Time- and Angle-Resolved Photoemission Can Be Used to Spectroscopically Detect Transient Topological States in Graphene

Schüler, M., de Giovannini, U., Hübener, H., Rubio, A., Sentef, M. A., Devereaux, T. P., et al. (2020). How Circular Dichroism in Time- and Angle-Resolved Photoemission Can Be Used to Spectroscopically Detect Transient Topological States in Graphene. Physical Review X, 10(4): 041013. doi:10.1103/PhysRevX.10.041013.

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Item Permalink: http://hdl.handle.net/21.11116/0000-0005-F4C6-8 Version Permalink: http://hdl.handle.net/21.11116/0000-0007-45D0-0
Genre: Journal Article

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PhysRevX.10.041013.pdf (Publisher version), 2MB
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PhysRevX.10.041013.pdf
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Open Access. - ublished by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article’s title, journal citation, and DOI.
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2020
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© the Author(s). Published by the American Physical Society.

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https://arxiv.org/abs/2003.11621 (Preprint)
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https://dx.doi.org/10.1103/PhysRevX.10.041013 (Publisher version)
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 Creators:
Schüler, M.1, Author
de Giovannini, U.2, 3, Author              
Hübener, H.3, Author              
Rubio, A.2, 3, 4, Author              
Sentef, M. A.5, Author              
Devereaux, T. P.1, 6, Author
Werner, P.7, Author
Affiliations:
1Stanford Institude for Materials and Energy Sciences (SIMES), SLAC National Accelerator Laboratory, ou_persistent22              
2Nano-Bio Spectroscopy Group, Departamento de Fisica de Materiales, Universidad del País Vasco UPV/EHU, ou_persistent22              
3Theory Group, Theory Department, Max Planck Institute for the Structure and Dynamics of Matter, Max Planck Society, ou_2266715              
4Center for Computational Quantum Physics (CCQ), The Flatiron Institute, ou_persistent22              
5Theoretical Description of Pump-Probe Spectroscopies in Solids, Theory Department, Max Planck Institute for the Structure and Dynamics of Matter, Max Planck Society, ou_3012828              
6Department of Materials Science and Engineering, Stanford University, ou_persistent22              
7Department of Physics, University of Fribourg, ou_persistent22              

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 Abstract: Pumping graphene with circularly polarized light is the archetype of light-tailoring topological bands. Realizing the induced Floquet-Chern-insulator state and demonstrating clear experimental evidence for its topological nature has been a challenge, and it has become clear that scattering effects play a crucial role. We tackle this gap between theory and experiment by employing microscopic quantum kinetic calculations including realistic electron-electron and electron-phonon scattering. Our theory provides a direct link to the build up of the Floquet-Chern-insulator state in light-driven graphene and its detection in time- and angle-resolved photoemission spectroscopy (ARPES). This approach allows us to study the robustness of the Floquet features against dephasing and thermalization effects. We also discuss the ultrafast Hall response in the laser-heated state. Furthermore, the induced pseudospin texture and the associated Berry curvature give rise to momentum-dependent orbital magnetization, which is reflected in circular dichroism in ARPES (CD-ARPES). Combining our nonequilibrium calculations with an accurate one-step theory of photoemission allows us to establish a direct link between the build up of the topological state and the dichroic pump-probe photoemission signal. The characteristic features in CD-ARPES are shown to be stable against heating and dephasing effects. Thus, tracing circular dichroism in time-resolved photoemission provides new insights into transient topological properties.

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Language(s): eng - English
 Dates: 2020-06-232020-03-252020-08-252020-10-19
 Publication Status: Published online
 Pages: -
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 Table of Contents: -
 Rev. Type: Peer
 Identifiers: arXiv: 2003.11621
DOI: 10.1103/PhysRevX.10.041013
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Title: Physical Review X
  Abbreviation : Phys. Rev. X
Source Genre: Journal
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Publ. Info: New York, NY : American Physical Society
Pages: - Volume / Issue: 10 (4) Sequence Number: 041013 Start / End Page: - Identifier: Other: 2160-3308
CoNE: https://pure.mpg.de/cone/journals/resource/2160-3308