title: 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 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.
authors.affiliation: Laboratoire de Physique des Solides, CNRS-UMR 8502, Université Paris-Sud, F-91405 Orsay, France.
authors.forename: E
authors.initials: E
authors.lastname: Papalazarou
authors.forename: J
authors.initials: J
authors.lastname: Faure
authors.forename: J
authors.initials: J
authors.lastname: Mauchain
authors.forename: M
authors.initials: M
authors.lastname: Marsi
authors.forename: A
authors.initials: A
authors.lastname: Taleb-Ibrahimi
authors.forename: I
authors.initials: I
authors.lastname: Reshetnyak
authors.forename: A
authors.initials: A
authors.lastname: van Roekeghem
authors.forename: I
authors.initials: I
authors.lastname: Timrov
authors.forename: N
authors.initials: N
authors.lastname: Vast
authors.forename: B
authors.initials: B
authors.lastname: Arnaud
authors.forename: L
authors.initials: L
authors.lastname: Perfetti