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  Monitoring electron-photon dressing in WSe2

De Giovannini, U., Hübener, H., & Rubio, A. (2016). Monitoring electron-photon dressing in WSe2. Nano Letters, 16(12), 7993-7998. doi:10.1021/acs.nanolett.6b04419.

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https://doi.org/10.1021/acs.nanolett.6b04419 (Verlagsversion)
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 Urheber:
De Giovannini, Umberto1, 2, Autor
Hübener, Hannes1, Autor
Rubio, Angel1, 3, 4, Autor           
Affiliations:
1Nano-Bio Spectroscopy Group and ETSF, Universidad del País Vasco, CFM CSIC-UPV/EHU, 20018 San Sebastián, Spain, ou_persistent22              
2Dipartimento di Fisica e Chimica, Universitá degli Studi di Palermo, Via Archirafi 36, I-90123, Palermo, Italy, ou_persistent22              
3Theory Group, Theory Department, Max Planck Institute for the Structure and Dynamics of Matter, Max Planck Society, ou_2266715              
4Center for Free-Electron Laser Science and Department of Physics, University of Hamburg, Luruper Chaussee 149, 22761 Hamburg, Germany, ou_persistent22              

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Schlagwörter: Condensed Matter; Materials Science; first principles calculations; photo-electron spectroscopy; non-equilibrium bandstructure; pump-probe spectroscopy; Floquet theory
 Zusammenfassung: Optical pumping of solids creates a non-equilibrium electronic structure where electrons and photons combine to form quasiparticles of dressed electronic states. The resulting shift of electronic levels is known as the optical Stark effect, visible as a red shift in the optical spectrum. Here we show that in a pump-probe setup we can uniquely define a non-equilibrium quasiparticle bandstructure that can be directly measurable with photoelectron spectroscopy. The dynamical photon-dressing (and undressing) of the many-body electronic states can be monitored by pump-probe time and angular resolved photoelectron spectroscopy (tr-ARPES) as the photon-dressed bandstructure evolves in time depending on the pump-probe pulse overlap. The computed tr-ARPES spectrum agrees perfectly with the quasi-energy spectrum of Floquet theory at maximum overlap and goes to the the equilibrium bandstructure as the pump-probe overlap goes to zero. Additionally, we show how this time-dependent non-equilibrium quasiparticle structure can be understood to be the bandstructure underlying the optical Stark effect. The extension to spin-resolved ARPES can be used to predict asymmetric dichroic response linked to the valley selective optical excitations in monolayer transition metal dichalcogenides (TMDs). These results establish the photon dressed non-equilibrium bandstructures as the underlying quasiparticle structure of light-driven steady-state quantum phases of matter.

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Sprache(n): eng - English
 Datum: 2016-09-112016-09-132016-10-212016-11-232016-12
 Publikationsstatus: Erschienen
 Seiten: 6
 Ort, Verlag, Ausgabe: -
 Inhaltsverzeichnis: -
 Art der Begutachtung: Expertenbegutachtung
 Identifikatoren: DOI: 10.1021/acs.nanolett.6b04419
arXiv: 1609.03218
 Art des Abschluß: -

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Projektinformation

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Projektname : We are grateful for illuminating discussions with M. Sentef and R. Ernstorfer. We acknowledge financial support from the European Research Council (ERC-2015-AdG-694097), Spanish Grant (FIS2013-46159-C3-1-P), Grupos Consolidados (IT578-13), AFOSR Grant FA2386-15-1-0006 AOARD 144088, and European Unions Horizon 2020 Research and Innovation program under Grant Agreements 676580 (NOMAD) and 646259 (MOSTOPHOS). H.H. acknowledges support from the People Programme (Marie Curie Actions) of the European Union’s Seventh Framework Programme FP7-PEOPLE-2013-IEF project No. 622934.
Grant ID : 676580
Förderprogramm : Horizon 2020 (H2020)
Förderorganisation : European Commission (EC)
Projektname : We are grateful for illuminating discussions with M. Sentef and R. Ernstorfer. We acknowledge financial support from the European Research Council (ERC-2015-AdG-694097), Spanish Grant (FIS2013-46159-C3-1-P), Grupos Consolidados (IT578-13), AFOSR Grant FA2386-15-1-0006 AOARD 144088, and European Unions Horizon 2020 Research and Innovation program under Grant Agreements 676580 (NOMAD) and 646259 (MOSTOPHOS). H.H. acknowledges support from the People Programme (Marie Curie Actions) of the European Union’s Seventh Framework Programme FP7-PEOPLE-2013-IEF project No. 622934.
Grant ID : 646259
Förderprogramm : Horizon 2020 (H2020)
Förderorganisation : European Commission (EC)
Projektname : We are grateful for illuminating discussions with M. Sentef and R. Ernstorfer. We acknowledge financial support from the European Research Council (ERC-2015-AdG-694097), Spanish Grant (FIS2013-46159-C3-1-P), Grupos Consolidados (IT578-13), AFOSR Grant FA2386-15-1-0006 AOARD 144088, and European Unions Horizon 2020 Research and Innovation program under Grant Agreements 676580 (NOMAD) and 646259 (MOSTOPHOS). H.H. acknowledges support from the People Programme (Marie Curie Actions) of the European Union’s Seventh Framework Programme FP7-PEOPLE-2013-IEF project No. 622934.
Grant ID : 622934
Förderprogramm : Funding Programme 7 (FP7)
Förderorganisation : European Commission (EC)

Quelle 1

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Titel: Nano Letters
  Kurztitel : Nano Lett.
Genre der Quelle: Zeitschrift
 Urheber:
Affiliations:
Ort, Verlag, Ausgabe: Washington, DC : American Chemical Society
Seiten: - Band / Heft: 16 (12) Artikelnummer: - Start- / Endseite: 7993 - 7998 Identifikator: ISSN: 1530-6984
CoNE: https://pure.mpg.de/cone/journals/resource/110978984570403