dc.contributor.author | Schuler, Michael | |
dc.contributor.author | De Giovannini, Umberto | |
dc.contributor.author | Huebener, Hannes | |
dc.contributor.author | Rubio Secades, Angel | |
dc.contributor.author | Sentef, Michael A. | |
dc.contributor.author | Devereaux, Thomas P. | |
dc.contributor.author | Werner, Philipp | |
dc.date.accessioned | 2021-02-09T09:30:50Z | |
dc.date.available | 2021-02-09T09:30:50Z | |
dc.date.issued | 2020-10-19 | |
dc.identifier.citation | Physical Review X 10(4) : (2020) // Article ID 041013 | es_ES |
dc.identifier.issn | 2160-3308 | |
dc.identifier.uri | http://hdl.handle.net/10810/50113 | |
dc.description.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. | es_ES |
dc.description.sponsorship | We acknowledge helpful discussion with Shunsuke A. Sato. M. S. and T. P. D. acknowledge financial support from the U.S. Department of Energy, Office of Basic Energy Sciences, Division of Materials Sciences and Engineering, under Contract No. DE-AC02-76SF00515. Furthermore, this work is supported by the Swiss National Science Foundation via NCCR MARVEL and the European Research Council via Grant No. ERC-2015-AdG-694097 and ERC Consolidator Grant No. 724103. The Flatiron Institute is a division of the Simons Foundation. M. S. thanks the Alexander von Humboldt Foundation for its support with a Feodor Lynen scholarship and the department. M. A. S. acknowledges financial support from the DFG through the Emmy Noether program (Grant No. SE 2558/2-1). The computational work used resources at the National Energy Research Scientific Computing Center (NERSC), a U.S. DOE Office of Science User Facility operated under Contract No. DE-AC02-05CH11231, at the Sherlock cluster at Stanford University, and the BEO5 cluster at the University of Fribourg. | es_ES |
dc.language.iso | eng | es_ES |
dc.publisher | American Physical Society | es_ES |
dc.relation | info:eu-repo/grantAgreement/EC/H2020/694097 | es_ES |
dc.relation | info:eu-repo/grantAgreement/EC/H2020/724103 | es_ES |
dc.rights | info:eu-repo/semantics/openAccess | es_ES |
dc.rights.uri | http://creativecommons.org/licenses/by/3.0/es/ | * |
dc.subject | floquet-bloch | es_ES |
dc.subject | driven | es_ES |
dc.subject | spin | es_ES |
dc.title | How Circular Dichroism in Time and Angle-Resolved Photoemission Can Be Used to Spectroscopically Detect Transient Topological States in Graphene | es_ES |
dc.type | info:eu-repo/semantics/article | es_ES |
dc.rights.holder | Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license (CC BY 4.0) | es_ES |
dc.rights.holder | Atribución 3.0 España | * |
dc.relation.publisherversion | https://journals.aps.org/prx/abstract/10.1103/PhysRevX.10.041013 | es_ES |
dc.identifier.doi | 10.1103/PhysRevX.10.041013 | |
dc.contributor.funder | European Commission | |
dc.departamentoes | Física de materiales | es_ES |
dc.departamentoeu | Materialen fisika | es_ES |