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Journal Articles Physical Review B: Condensed Matter and Materials Physics (1998-2015) Year : 2013

Ultrafast filling of an electronic pseudogap in an incommensurate crystal

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Abstract

We investigate the quasiperiodic crystal (LaS)1.196(VS2) by angle and time resolved photoemission spectroscopy. The dispersion of electronic states is in qualitative agreement with band structure calculated for the VS2 slab without the incommensurate distortion. Nonetheless, the spectra display a temperature dependent pseudogap instead of quasiparticles crossing. The sudden photoexcitation at 50 K induces a partial filling of the electronic pseudogap within less than 80 fs. The electronic energy flows into the lattice modes on a comparable timescale. We attribute this surprisingly short timescale to a very strong electron-phonon coupling to the incommensurate distortion. This result sheds light on the electronic localization arising in aperiodic structures and quasicrystals.

Dates and versions

hal-00982111 , version 1 (23-04-2014)

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Cite

V. Brouet, Julien Mauchain, E. Papalazarou, Jérôme Faure, M. Marsi, et al.. Ultrafast filling of an electronic pseudogap in an incommensurate crystal. Physical Review B: Condensed Matter and Materials Physics (1998-2015), 2013, 87 (4), pp.041106. ⟨10.1103/PhysRevB.87.041106⟩. ⟨hal-00982111⟩
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