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RESEARCH PRODUCT
Light-Induced Renormalization of the Dirac Quasiparticles in the Nodal-Line Semimetal ZrSiSe
U. De GiovanniniAaron BostwickS. PolishchukNicolas Tancogne-dejeanL. MoreschiniL. MoreschiniAlberto CrepaldiG. GattiHelmuth BergerFabio FrassettoSimon MoserSimon MoserArnaud MagrezMichele PuppinSilvan RothLede XianAngel RubioAngel RubioLuca PolettoPh. BugnonMarco GrioniMajed CherguiEli Rotenbergsubject
General PhysicsHubbard modelDirac (software)General Physics and AstronomyFOS: Physical sciencesElectronic structurespin01 natural sciencesMathematical SciencesSettore FIS/03 - Fisica Della Materiasymbols.namesakeCondensed Matter - Strongly Correlated ElectronsEngineeringTDDFT0103 physical sciences010306 general physicsElectronic band structurePhysicsCondensed Matter - Materials ScienceCondensed matter physicsStrongly Correlated Electrons (cond-mat.str-el)Fermi levelMaterials Science (cond-mat.mtrl-sci)dynamicsARPESPhysical SciencesQuasiparticleDensity of statessymbols1st-principlesDensity functional theorydescription
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.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 2020-08-14 |