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TT: Fachverband Tiefe Temperaturen

TT 27: Topological Semimetals 2

TT 27.8: Vortrag

Dienstag, 17. März 2020, 15:45–16:00, HSZ 103

Metal-to-insulator transition in a Dirac semimetal: the case of BaNi_xCo_1−xS₂ — •Benjamin Lenz and Michele Casula — Institut de Minéralogie, de Physique des Matériaux et de Cosmochimie, Sorbonne Université, 4 Place Jussieu, 75005 Paris, France

We study the mechanism behind the metal-to-insulator transition in the correlated BaNi_xCo_1−xS₂ series, by using advanced many-body first-principles methods, such as a combination of density functional theory and dynamical mean field theory (DFT+DMFT).
The BaNi_xCo_1−xS₂ family, first considered as a potential candidate for high-temperature superconductivity, has seen a renewed attention for its fascinating spin properties. BaNiS₂ is a Dirac semimetal, with 4 Dirac cones lying at the Fermi level, and with strong spin-orbit coupling, placing it close to a topological phase.
Rationalizing its phase diagram as a function of doping and temperature offers a unique opportunity to understand the interplay between topology and correlation in an experimentally accessible situation.