Dresden 2020 – wissenschaftliches Programm

Die DPG-Frühjahrstagung in Dresden musste abgesagt werden! Lesen Sie mehr ...

Bereiche | Tage | Auswahl | Suche | Aktualisierungen | Downloads | Hilfe

TT: Fachverband Tiefe Temperaturen

TT 42: Correlated Electrons: f-Electron Systems and Heavy Fermions 2

TT 42.3: Vortrag

Mittwoch, 18. März 2020, 15:30–15:45, HSZ 204

Topology in Magnetic Phases of SmB6 — •Moritz M. Hirschmann, Huimei Liu, Andreas P. Schnyder, and Giniyat Khaliullin — Max Planck Institute for Solid State Research, Stuttgart, Deutschland

The heavy fermion compound SmB6 is well known to be a Kondo insulator. Whereas its paramagnetic state was found to be topological, an analysis of the magnetic phases emerging in high-pressure SmB6 considering its f-quartet ground state is still lacking. The exact magnetic order is yet unknown, therefore we discuss the two most likely magnetic structures, A-type and G-type, as well the high-field limit. We offer topological features as an experimental starting point to determine the magnetic order. With this in mind we present Dirac nodal lines for the A-type structure and Dirac points for the G-type structure. To investigate the topological properties we describe the mixed valence samarium sites with a tight-binding model and incorporate the effect of an internal magnetization. Our discussion includes symmetry arguments, Berry phases and the resulting surface states.

100% | Mobil-Ansicht | English Version | Kontakt/Impressum/Datenschutz
DPG-Physik > DPG-Verhandlungen > 2020 > Dresden