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  Ultrafast momentum imaging of pseudospin-flip excitations in graphene

Aeschlimann, S., Krause, R., Chavez Cervantes, M., Bromberger, H., Jago, R., Malić, E., et al. (2017). Ultrafast momentum imaging of pseudospin-flip excitations in graphene. Physical Review B, 96(2): 020301. doi:10.1103/PhysRevB.96.020301.

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https://dx.doi.org/10.1103/PhysRevB.96.020301 (Verlagsversion)
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 Urheber:
Aeschlimann, Sven1, 2, Autor           
Krause, R.1, 2, Autor           
Chavez Cervantes, M.1, 2, Autor           
Bromberger, H.2, 3, Autor           
Jago, R.4, Autor
Malić, E.4, Autor
Al-Temimy, A.5, Autor
Coletti, C.5, Autor
Cavalleri, A.2, 3, Autor           
Gierz, Isabella1, 2, Autor           
Affiliations:
1Ultrafast Electron Dynamics, Condensed Matter Dynamics Department, Max Planck Institute for the Structure and Dynamics of Matter, Max Planck Society, ou_1938295              
2Center for FreeElectron Laser Science, ou_persistent22              
3Quantum Condensed Matter Dynamics, Condensed Matter Dynamics Department, Max Planck Institute for the Structure and Dynamics of Matter, Max Planck Society, ou_1938293              
4Department of Physics, Chalmers University of Technology, 41258 Gothenburg, Sweden, ou_persistent22              
5Center for Nanotechnology @ NEST, Istituto Italiano di Tecnologia, Pisa, Italy, ou_persistent22              

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 Zusammenfassung: The chiral character of Dirac electrons in graphene manifests itself in a peculiar momentum anisotropy for photo-excited electron-hole pairs. These interband excitations are in fact forbidden along the direction of the light polarization, and are maximum perpendicular to it. This phenomenon gives rise to unconventional hot carrier dynamics that are only partially understood. Here, we use time- and angle-resolved photoemission spectroscopy to investigate the non-thermal physics of such chiral excitations, sampling carrier distributions as a function of energy and in-plane momentum. We rst show that the rapidly-established quasi-thermal electron distribution initally exhibits an azimuth-dependent temperature, consistent with relaxation through collinear electron-electron scattering. Azimuthal thermalization is found to occur only at longer time delays, at a rate that is dependent on the type of static doping. In n-doped graphene, for which photo-excited carriers are generated close to the Fermi level, the anisotropy of the carrier temperature survives far longer than in p-doped graphene. We attribute this to the strong suppression of azimuthal relaxation due to a reduced phase space for optical phonon emission in the n-doped case. These experiments clarify new aspects of hot carrier dynamics that are unique to Dirac materials, with relevance for photo-control experiments and optoelectronic device applications.

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Sprache(n): eng - English
 Datum: 2017-01-232017-07-102017-07-10
 Publikationsstatus: Erschienen
 Seiten: 10
 Ort, Verlag, Ausgabe: -
 Inhaltsverzeichnis: -
 Art der Begutachtung: Expertenbegutachtung
 Identifikatoren: arXiv: 1701.06314
DOI: 10.1103/PhysRevB.96.020301
 Art des Abschluß: -

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Projektname : This work received financial support from the German Research Foundation through the Priority Program SPP 1459 and the Collaborative Research Center SFB 925 as well as the European Union's Horizon 2020 Research and Innovation Programme under Grant Agreement No. 696656-GrapheneCore1.
Grant ID : 696656
Förderprogramm : Horizon 2020 (H2020)
Förderorganisation : European Commission (EC)

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Titel: Physical Review B
  Kurztitel : Phys. Rev. B
Genre der Quelle: Zeitschrift
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Affiliations:
Ort, Verlag, Ausgabe: Woodbury, NY : American Physical Society
Seiten: - Band / Heft: 96 (2) Artikelnummer: 020301 Start- / Endseite: - Identifikator: ISSN: 1098-0121
CoNE: https://pure.mpg.de/cone/journals/resource/954925225008