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  Non-equilibrium Dirac carrier dynamics in graphene investigated with time- and angle-resolved photoemission spectroscopy

Gierz, I., Link, S., Starke, U., & Cavalleri, A. (2014). Non-equilibrium Dirac carrier dynamics in graphene investigated with time- and angle-resolved photoemission spectroscopy. Faraday Discussions, 171, 311-321. doi:10.1039/C4FD00020J.

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Item Permalink: http://hdl.handle.net/11858/00-001M-0000-0024-C31D-4 Version Permalink: http://hdl.handle.net/11858/00-001M-0000-0024-C31E-2
Genre: Journal Article

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https://dx.doi.org/10.1039/C4FD00020J (Publisher version)
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 Creators:
Gierz, I.1, Author              
Link, S.2, Author
Starke, U.2, Author
Cavalleri, A.3, Author              
Affiliations:
1Ultrafast Electron Dynamics, Condensed Matter Dynamics Department, Max Planck Institute for the Structure and Dynamics of Matter, Max Planck Society, ou_1938295              
2Max Planck Institute for Solid State Research, Stuttgart, Germany, 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              

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 Abstract: We have used time- and angle-resolved photoemission spectroscopy (tr-ARPES) to assess the influence of many-body interactions on the Dirac carrier dynamics in graphene. From the energy-dependence of the measured scattering rates we directly determine the imaginary part of the self-energy, visualizing the existence of a relaxation bottleneck associated with electron-phonon coupling. A comparison with static line widths obtained by high-resolution ARPES indicates that the dynamics of photo-excited carriers in graphene are solely determined by the equilibrium self-energy. Furthermore, the subtle interplay of different many-body interactions in graphene may allow for carrier multiplication, where the absorption of a single photon generates more than one electron-hole pair via impact ionization. We find that, after photo-excitation, the number of carriers in the conduction band along the ΓK-direction keeps increasing for about 40 fs after the pump pulse is gone. A definite proof of carrier multiplication in graphene, however, requires a more systematic study, carefully taking into account the contribution of momentum relaxation on the measured rise time.

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Language(s): eng - English
 Dates: 2014-02-212014-04-282014-04-28
 Publication Status: Published online
 Pages: -
 Publishing info: -
 Table of Contents: -
 Rev. Method: Peer
 Identifiers: BibTex Citekey: Gierz2014311
DOI: 10.1039/C4FD00020J
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Title: Faraday Discussions
  Abbreviation : Faraday Discuss.
Source Genre: Journal
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Publ. Info: London : Royal Society of Chemistry
Pages: - Volume / Issue: 171 Sequence Number: - Start / End Page: 311 - 321 Identifier: ISSN: 1359-6640
CoNE: /journals/resource/954925269326