Light-induced renormalization of the Dirac quasiparticles in the nodal-line semimetal ZrSiSe

(submitted), (2019)

Light-induced renormalization of the Dirac quasiparticles in the nodal-line semimetal ZrSiSe

G. Gatti, A. Crepaldi, M. Puppin, N. Tancogne-Dejean, L. Xian, S. Roth, S. Polishchuk, Ph. Bugnon, A. Magrez, H. Berger, F. Frassetto, L. Poletto, L. Moreschini, S. Moser, A. Bostwick, E. Rotenberg, A. Rubio, M. Chergui, M. Grioni

In nodal-line semimetals linearly dispersing states form Dirac loops in the reciprocal space, with high degree of electron-hole symmetry and almost-vanishing density of states near the Fermi level. The result is reduced electronic screening and enhanced correlations between Dirac quasiparticles. Here we investigate the electronic structure of ZrSiSe, by combining time- and angle-resolved photoelectron spectroscopy with ab initio density functional theory (DFT) complemented by an extended Hubbard model (DFT +U +V). We show that electronic correlations are reduced on an ultrashort timescale by optical excitation of high-energy electrons-hole pairs, which transiently screen the Coulomb interaction. Our findings demonstrate an all-optical method for engineering the band structure of a quantum material.

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arxiv
http://arxiv.org/abs/1912.09673
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We acknowledge financial support by the Swiss National Science Foundation (SNSF), via the NCCR:MUST and the contracts No. 206021-157773, and 407040-154056 (PNR 70). This work was supported by the ERC Advanced Grant H2020 ERCEA 695197 DYNAMOX, the ERC-2015-AdG694097, the Cluster of Excellence (AIM), Grupos Consolidados(IT1249-19) and SFB925. The Flatiron Institute is a division of the Simons Foundation. S.M. acknowledges support by the Swiss National Science Foundation (Grant No. P300P2-171221). This research used resources of the Advanced Light Source, which is a DOE Office of Science User Facility under contract no. DE-AC02-05CH11231.

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