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

Abstract : 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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https://hal.archives-ouvertes.fr/hal-03070498
Contributor : Michele Casula <>
Submitted on : Tuesday, January 5, 2021 - 12:50:34 PM
Last modification on : Tuesday, January 19, 2021 - 3:32:39 AM

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PhysRevResearch.2.043397.pdf
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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, American Physical Society, 2020, 2 (4), ⟨10.1103/PhysRevResearch.2.043397⟩. ⟨hal-03070498v2⟩

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