Coherent Phonon Coupling to Individual Bloch States in Photoexcited Bismuth

Abstract : 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.
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Submitted on : Tuesday, June 16, 2015 - 9:48:48 AM
Last modification on : Wednesday, March 27, 2019 - 4:26:02 PM

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

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