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MA: Fachverband Magnetismus
MA 9: Weyl Semimetals
MA 9.2: Vortrag
Montag, 16. März 2020, 11:45–12:00, POT 6
Quadrupolar Weyl metal in magnetically ordered pyrochlore iridates — •Konstantinos Ladovrechis1, Bitan Roy2,3, and Tobias Meng1 — 1Institut für Theoretische Physik and Würzburg-Dresden Cluster of Excellence ct.qmat, Technische Universität Dresden, 01062 Dresden, Germany — 2Max-Planck-Institut für Physik komplexer Systeme, Nöthnitzer Straße 38, 01187 Dresden, Germany — 3Department of Physics, Lehigh University, Bethlehem, Pennsylvania 18015, USA
Pyrochlore iridates are a class of materials in which the confluence of electronic interactions and emergent topology leads to a plethora of exotic states of matter. In this work, we study an effective low-energy Luttinger model accounting for a quadratic band touching (QBT) around the Γ point, and study interaction-induced instabilities of the QBT. In particular, we analyze the impact of a new type of magnetic order transforming under the T2u irreducible representation of the cubic point group. This magnetic order is of octupolar character. It breaks time-reversal symmetry but is inversion-invariant, and thus for example stabilized quadrupoles of Weyl points on different planes in the Brillouin zone. By classifying these unconventional electronic structures, we comment on experimental signatures of this new magnetic order in itinerant pyrochlore iridates, for example in transport experiments.