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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.

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Item Permalink: http://hdl.handle.net/21.11116/0000-0005-F4C6-8 Version Permalink: http://hdl.handle.net/21.11116/0000-0005-F4CC-2
Genre: Paper

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2003.11621.pdf (Preprint), 5MB
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https://arxiv.org/abs/2003.11621 (Preprint)
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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 tracing clear experimental manifestions 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 allows us to study the stability of the Floquet features due to 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 gives 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 further corroborated to be stable against heating and dephasing effects. Thus, tracing circular dichroism in time-resolve photoemission provides new insights into transient topological properties.

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Language(s): eng - English
 Dates: 2020-03-25
 Publication Status: Published online
 Pages: 16
 Publishing info: -
 Table of Contents: -
 Rev. Method: No review
 Identifiers: arXiv: 2003.11621
 Degree: -

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