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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.
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Submitted on : Tuesday, November 26, 2013 - 9:14:53 AM
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Evangelos Papalazarou, Jérôme Faure, Julien Mauchain, Marino Marsi, Amina 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-00908278⟩



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