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Article Dans Une Revue Physical Review B Année : 2021

Photoinduced Dirac-cone flattening in Ba Ni S 2

Nikolaj Bittner
  • Fonction : Auteur
Denis Golež
  • Fonction : Auteur
Philipp Werner
  • Fonction : Auteur

Résumé

Using a real-time implementation of the self-consistent GW method, we theoretically investigate the photoinduced changes in the electronic structure of the quasi two-dimensional semi-metal BaNiS2. This material features four Dirac cones in the unit cell and our simulation of the time-and momentum-resolved nonequilibrium spectral function reveals a flattening of the Dirac bands after a photo-doping pulse with a 1.5 eV laser. The simulation results are consistent with the recently reported experimental data on photo-doped BaNiS2 and ZrSiSe, another Dirac semi-metal. A detailed analysis of the numerical data allows us to attribute the nonequilibrium modifications of the Dirac bands to (i) an increased effective temperature after the photo-excitation, which affects the screening properties of the system, and (ii) to nontrivial band shifts in the photo-doped state, which are mainly induced by the Fock term.
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Dates et versions

hal-03450367 , version 1 (26-11-2021)

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Nikolaj Bittner, Denis Golež, Michele Casula, Philipp Werner. Photoinduced Dirac-cone flattening in Ba Ni S 2. Physical Review B, 2021, 104 (11), ⟨10.1103/PhysRevB.104.115138⟩. ⟨hal-03450367⟩
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