Photoinduced renormalization and electronic screening of quasi-two-dimensional Dirac states in BaNiS_{2}

Photoinduced renormalization and electronic screening of quasi-two-dimensional Dirac states in BaNiS_{2}

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 BaNiS_{2}. This effect is accompanied by a nonrigid shift of the bands at the center of the Brill...

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Bibliographic Details
Main Authors: N. Nilforoushan, M. Casula, M. Caputo, E. Papalazarou, J. Caillaux, Z. Chen, L. Perfetti, A. Amaricci, D. Santos-Cottin, Y. Klein, A. Gauzzi, M. Marsi
Format: Article
Language:English
Published: American Physical Society 2020-12-01
Series:Physical Review Research
Online Access:http://doi.org/10.1103/PhysRevResearch.2.043397
Description
Summary: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 BaNiS_{2}. 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.
ISSN:2643-1564

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