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Article Dans Une Revue Physical Review Research Année : 2020

Photoinduced renormalization and electronic screening of quasi-two-dimensional Dirac states in BaNiS$_2$

Niloufar Nilforoushan
Marco Caputo
  • Fonction : Auteur
Evangelos Papalazarou
  • Fonction : Auteur
Jonathan Caillaux
  • Fonction : Auteur
Zhesheng Cheng
  • Fonction : Auteur
Luca Perfetti
Adriano Amaricci
David Santos-Cottin
  • Fonction : Auteur
Yannick Klein
Andrea Gauzzi
Marino Marsi

Résumé

By means of time- and angle-resolved photoelectron spectroscopy, we give evidence of a remarkable reduction of the Fermi velocity of out-of-equilibrium Dirac bands in the quasi-two-dimensional semimetal BaNiS2. This effect is accompanied by a nonrigid shift of the bands at the center of the Brillouin zone. Analytical and first-principles calculations indicate that this band renormalization is ascribed to a change in nonlocal electron correlations driven by a photoinduced enhancement of screening properties. Our results are explained by a scaling relation between inverse screening length and electronic temperature that is of general relevance for the description of out-of-equilibrium dynamics and screening effects in all layered Dirac materials.
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Dates et versions

hal-03070498 , version 1 (15-12-2020)
hal-03070498 , version 2 (05-01-2021)

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Niloufar Nilforoushan, Michele Casula, Marco Caputo, Evangelos Papalazarou, Jonathan Caillaux, et al.. Photoinduced renormalization and electronic screening of quasi-two-dimensional Dirac states in BaNiS$_2$. Physical Review Research, 2020, 2 (4), ⟨10.1103/PhysRevResearch.2.043397⟩. ⟨hal-03070498v2⟩
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