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

MPS-Authors

Waldecker,  L.
Fritz Haber Institut of the Max Planck Society;
Stanford University;

Bertoni,  R.
Fritz Haber Institut of the Max Planck Society;
Univ Rennes 1, CNRS, Institut de Physique de Rennes, UMR 6251, UBL;

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Hübener,  H.
Theory Group, Theory Department, Max Planck Institute for the Structure and Dynamics of Matter, Max Planck Society;

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Brumme,  T.
Theory Group, Theory Department, Max Planck Institute for the Structure and Dynamics of Matter, Max Planck Society;

Vasileiadis,  T.
Fritz Haber Institut of the Max Planck Society;

Zahn,  D.
Fritz Haber Institut of the Max Planck Society;

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Rubio,  A.
Theory Group, Theory Department, Max Planck Institute for the Structure and Dynamics of Matter, Max Planck Society;

Ernstorfer,  R.
Fritz Haber Institut of the Max Planck Society;

Fulltext (public)

PhysRevLett.119.036803.pdf
(Publisher version), 740KB

Supplementary Material (public)
There is no public supplementary material available
Citation

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.


Cite as: http://hdl.handle.net/21.11116/0000-0001-760C-E
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.