Dresden 2026 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 11: PtBi2
TT 11.2: Vortrag
Montag, 9. März 2026, 11:30–11:45, CHE/0091
Engineering Weyl nodes in the nodal-line semimetal PtBi2 — •Ankit Kumar1,2, Joseph Dufouleur1, and Bernd Büchner1,2 — 1Leibniz Institute for Solid State and Materials Research(IFW) Dresden — 2Department of Physics, TU Dresden
The nonmagnetic Weyl and nodal-line semimetal PtBi2 has recently been shown an anomalous planar Hall effect (APHE), a phenomenon generated purely by Berry curvature surrounding Zeeman-induced Weyl points. The location of Zeeman-split Weyl nodes along the nodal line can be tuned.
In this work, we investigate the tunability of Weyl physics in PtBi2 through systematic APHE measurements performed under three-dimensional rotations of the magnetic field. By tilting the magnetic field out of plane, we are able to tune the amplitude of the anomalous Hall effect, obtaining a signal stronger or weaker than that measured in-plane. This behaviour provides evidence that the location of Zeeman-induced Weyl nodes can be manipulated by controlling the field orientation.
Our results establish a new pathway to engineer Zeeman-induced Weyl nodes in nodal line semimetals by a magnetic field.
Keywords: Weyl and nodal-line semimetal; Anomalous planar Hall effect (APHE); Three-dimensional rotations of the magnetic field