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  Anisotropy of quasiparticle lifetimes and the role of disorder in graphite from ultrafast time-resolved photoemission spectroscopy

Moos, G., Gahl, C., Fasel, R., Wolf, M., & Hertel, T. (2001). Anisotropy of quasiparticle lifetimes and the role of disorder in graphite from ultrafast time-resolved photoemission spectroscopy. Physical Review Letters, 87(26), 267402-1-267402-4. doi:10.1103/PhysRevLett.87.267402.

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Item Permalink: https://hdl.handle.net/11858/00-001M-0000-0011-172A-E Version Permalink: https://hdl.handle.net/21.11116/0000-0006-82B2-D
Genre: Journal Article

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 Creators:
Moos, Gunnar1, Author           
Gahl, Cornelius2, Author
Fasel, Roman1, Author           
Wolf, Martin1, Author           
Hertel, Tobias1, Author           
Affiliations:
1Physical Chemistry, Fritz Haber Institute, Max Planck Society, ou_634546              
2Max Planck Society, ou_persistent13              

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Free keywords: high-speed optical techniques; graphite; time resolved spectroscopy; quasiparticles; radiative lifetimes; band structure; photoemission
 Abstract: Femtosecond time-resolved photoemission of photoexcited electrons in highly oriented pyrolytic graphite (HOPG) provides strong evidence for anisotropies of quasiparticle (QP) lifetimes. Indicative of such anisotropies is a pronounced anomaly in the energy dependence of QP lifetimes between 1.1 and 1.5 eV—the vicinity of a saddle point in the graphite band structure. This is supported by recent ab initio calculations and a comparison with experiments on defect-enriched HOPG which reveal that disorder, e.g., defects or phonons, increases electron energy relaxation rates.

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Language(s): eng - English
 Dates: 2001-12-06
 Publication Status: Issued
 Pages: -
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 Table of Contents: -
 Rev. Type: Peer
 Identifiers: eDoc: 289266
URI: http://link.aps.org/abstract/PRL/v87/e267402
DOI: 10.1103/PhysRevLett.87.267402
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Title: Physical Review Letters
  Abbreviation : Phys. Rev. Lett.
Source Genre: Journal
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Publ. Info: Woodbury, N.Y. : American Physical Society
Pages: - Volume / Issue: 87 (26) Sequence Number: - Start / End Page: 267402-1 - 267402-4 Identifier: ISSN: 0031-9007
CoNE: https://pure.mpg.de/cone/journals/resource/954925433406_1