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Article Dans Une Revue Physical Review Letters Année : 2012

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 A1g 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.

Dates et versions

hal-01164042 , version 1 (16-06-2015)

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Citer

E. Papalazarou, Jérôme Faure, Julien Mauchain, M. Marsi, A. Taleb-Ibrahimi, et al.. Coherent Phonon Coupling to Individual Bloch States in Photoexcited Bismuth. Physical Review Letters, 2012, 108 (25), pp.256808. ⟨10.1103/PhysRevLett.108.256808⟩. ⟨hal-01164042⟩
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