Hélène Seiler, Daniela Zahn, Marios Zacharias, Patrick Hildebrandt, Thomas Vasileiadis, Yoav William Windsor, Yingpeng Qi, Christian Carbogno, Claudia Draxl, Fabio Caruso, and Ralph Ernstorfer:
(?), (2020), pp ;
arXiv:2006.12873 [cond-mat.mes-hall] (2020), pp. 13;
DOI: arXiv:2006.12873 [cond-mat.mes-hall]
Microscopic scattering processes in solids are governed by the symmetry and anisotropy of the electronic and phononic structures. Femtosecond electron inelastic scattering experiments reveal a momentum-resolved picture of transient anisotropic phonon populations in photoexcited black phosphorus. Based on many-body calculations of the electron-phonon and phonon-phonon interactions, we developed an approach to predict the influence of the non-equilibrium lattice dynamics on the structure factor. By directly comparing the experimental and calculated structure factors, we demonstrate that the anisotropic conduction band is at the origin of the non-thermal phonon population and that our model reproduces the subsequent lattice thermalization.
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