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  Momentum-Resolved View of Electron-Phonon Coupling in Multilayer WSe2

Waldecker, L., Bertoni, R., Hübener, H., Brumme, T., Vasileiadis, T., Zahn, D., et al. (2017). Momentum-Resolved View of Electron-Phonon Coupling in Multilayer WSe2. Physical Review Letters, 119(3): 036803. doi:10.1103/PhysRevLett.119.036803.

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Item Permalink: http://hdl.handle.net/21.11116/0000-0001-760C-E Version Permalink: http://hdl.handle.net/21.11116/0000-0003-A36F-9
Genre: Journal Article

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PhysRevLett.119.036803.pdf (Publisher version), 740KB
 
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 Creators:
Waldecker, L.1, 2, Author
Bertoni, R.1, 3, Author
Hübener, H.4, Author              
Brumme, T.4, Author              
Vasileiadis, T.1, Author
Zahn, D.1, Author
Rubio, A.4, Author              
Ernstorfer, R.1, Author
Affiliations:
1Fritz Haber Institut of the Max Planck Society, ou_persistent22              
2Stanford University, ou_persistent22              
3Univ Rennes 1, CNRS, Institut de Physique de Rennes, UMR 6251, UBL, ou_persistent22              
4Theory Group, Theory Department, Max Planck Institute for the Structure and Dynamics of Matter, Max Planck Society, ou_2266715              

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 Abstract: We investigate the interactions of photoexcited carriers with lattice vibrations in thin films of the layered transition metal dichalcogenide (TMDC) WSe2. Employing femtosecond electron diffraction with monocrystalline samples and first-principles density functional theory calculations, we obtain a momentum-resolved picture of the energy transfer from excited electrons to phonons. The measured momentum-dependent phonon population dynamics are compared to first-principles calculations of the phonon linewidth and can be rationalized in terms of electronic phase-space arguments. The relaxation of excited states in the conduction band is dominated by intervalley scattering between Σ valleys and the emission of zone boundary phonons. Transiently, the momentum-dependent electron-phonon coupling leads to a nonthermal phonon distribution, which, on longer time scales, relaxes to a thermal distribution via electron-phonon and phonon-phonon collisions. Our results constitute a basis for monitoring and predicting out of equilibrium electrical and thermal transport properties for nanoscale applications of TMDCs.

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Language(s): eng - English
 Dates: 2017-02-282017-07-212017-07-21
 Publication Status: Published in print
 Pages: -
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 Rev. Method: Peer
 Identifiers: DOI: 10.1103/PhysRevLett.119.036803
arXiv: 1703.03496
 Degree: -

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Project name : This project has received funding from the Max Planck Society and from the European Research Council (ERC) under the European Union’s Horizon 2020 research and innovation program (Grant Agreements No. ERC-2015-CoG-682843 and No. ERC-2015-AdG-694097). R. B. thanks the Alexander von Humboldt Foundation for financial support. 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. We acknowledge financial support from Grupos Consolidados (IT578-13) and the Air Force Office of Scientific Research Award (Grant No. FA2386-15-1-0006 AOARD 144088).
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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: 119 (3) Sequence Number: 036803 Start / End Page: - Identifier: ISSN: 0031-9007
CoNE: /journals/resource/954925433406_1