Coherent phonon coupling to individual Bloch states in photoexcited bismuth.
Résumé
We investigate the temporal evolution of the electronic states at the bismuth (111) surface by means of time- and angle-resolved photoelectron spectroscopy. The binding energy of bulklike bands oscillates with the frequency of the A(1g) phonon mode, whereas surface states are insensitive to the coherent displacement of the lattice. A strong dependence of the oscillation amplitude on the electronic wave vector is correctly reproduced by ab initio calculations of electron-phonon coupling. Besides these oscillations, all the electronic states also display a photoinduced shift towards higher binding energy whose dynamics follows the evolution of the electronic temperature.
Domaines
Biophysique
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Coherent_Phonon_Coupling_to_Individual_Bloch_States_in_Photoexcited_Bismuth.pdf (558.81 Ko)
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