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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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Item Permalink: http://hdl.handle.net/11858/00-001M-0000-0027-1267-F Version Permalink: http://hdl.handle.net/21.11116/0000-0004-B7EC-4
Genre: Journal Article

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https://dx.doi.org/10.1103/PhysRevB.96.020301 (Publisher version)
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https://arxiv.org/abs/1701.06314 (Preprint)
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 Creators:
Aeschlimann, Sven1, Author              
Krause, R.1, Author              
Chavez Cervantes, Mariana1, 2, Author              
Bromberger, H.3, Author              
Jago, R.4, Author
Malić, E.4, Author
Al-Temimy, A.5, Author
Coletti, C.5, Author
Cavalleri, A.3, Author              
Gierz, Isabella1, Author              
Affiliations:
1Ultrafast Electron Dynamics, Condensed Matter Dynamics Department, Max Planck Institute for the Structure and Dynamics of Matter, Max Planck Society, ou_1938295              
2International Max Planck Research School for Ultrafast Imaging & Structural Dynamics (IMPRS-UFAST), Max Planck Institute for the Structure and Dynamics of Matter, Max Planck Society, ou_2266714              
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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 Abstract: 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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Language(s): eng - English
 Dates: 2017-01-232017-07-102017-07-10
 Publication Status: Published in print
 Pages: 10
 Publishing info: -
 Table of Contents: -
 Rev. Method: Peer
 Identifiers: arXiv: 1701.06314
DOI: 10.1103/PhysRevB.96.020301
 Degree: -

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Project name : 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
Funding program : Horizon 2020 (H2020)
Funding organization : European Commission (EC)

Source 1

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Title: Physical Review B
  Abbreviation : Phys. Rev. B
Source Genre: Journal
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Publ. Info: Woodbury, NY : American Physical Society
Pages: - Volume / Issue: 96 (2) Sequence Number: 020301 Start / End Page: - Identifier: ISSN: 1098-0121
CoNE: /journals/resource/954925225008