Light-Induced Renormalization of the Dirac Quasiparticles in the Nodal-Line Semimetal ZrSiSe
In nodal-line semimetals, linearly dispersing states form Dirac loops in the reciprocal space with a high degree of electron-hole symmetry and a reduced density of states near the Fermi level. The result is reduced electronic screening and enhanced correlations between Dirac quasiparticles. Here we...
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| Veröffentlicht in: | Physical review letters 2020-08, Vol.125 (7), p.1-076401, Article 076401 |
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| creator | Gatti, G. Crepaldi, A. Puppin, M. Tancogne-Dejean, N. Xian, L. De Giovannini, U. Roth, S. Polishchuk, S. Bugnon, Ph Magrez, A. Berger, H. Frassetto, F. Poletto, L. Moreschini, L. Moser, S. Bostwick, A. Rotenberg, Eli Rubio, A. Chergui, M. Grioni, M. |
| description | In nodal-line semimetals, linearly dispersing states form Dirac loops in the reciprocal space with a high degree of electron-hole symmetry and a reduced 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) and by time-dependent 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. |
| doi_str_mv | 10.1103/PhysRevLett.125.076401 |
| format | Article |
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Advanced Light Source (ALS)</creatorcontrib><description>In nodal-line semimetals, linearly dispersing states form Dirac loops in the reciprocal space with a high degree of electron-hole symmetry and a reduced 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) and by time-dependent 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. 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Advanced Light Source (ALS)</creatorcontrib><title>Light-Induced Renormalization of the Dirac Quasiparticles in the Nodal-Line Semimetal ZrSiSe</title><title>Physical review letters</title><description>In nodal-line semimetals, linearly dispersing states form Dirac loops in the reciprocal space with a high degree of electron-hole symmetry and a reduced 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) and by time-dependent 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. 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Advanced Light Source (ALS)</aucorp><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Light-Induced Renormalization of the Dirac Quasiparticles in the Nodal-Line Semimetal ZrSiSe</atitle><jtitle>Physical review letters</jtitle><date>2020-08-14</date><risdate>2020</risdate><volume>125</volume><issue>7</issue><spage>1</spage><epage>076401</epage><pages>1-076401</pages><artnum>076401</artnum><issn>0031-9007</issn><eissn>1079-7114</eissn><abstract>In nodal-line semimetals, linearly dispersing states form Dirac loops in the reciprocal space with a high degree of electron-hole symmetry and a reduced 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) and by time-dependent 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. 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| subjects | CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY Density functional theory Electronic structure Electrons Elementary excitations High energy electrons Holes (electron deficiencies) light-matter interaction Metalloids node-line semimetals Photoelectrons time & angle resolved photoemission spectroscopy Time dependence topological materials |
| title | Light-Induced Renormalization of the Dirac Quasiparticles in the Nodal-Line Semimetal ZrSiSe |
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