SKM 2023 – wissenschaftliches Programm
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MM: Fachverband Metall- und Materialphysik
MM 6: Transport in Materials: Ion, Charge and Heat Transport
MM 6.10: Vortrag
Montag, 27. März 2023, 12:45–13:00, SCH A 118
Dragging effect of the Berry curvature in ferromagnetic Weyl semimetals NiMnSb and PtMnSb — Sukriti Singh1, •Ana García-Page1, Jonathan Noky1, Subhajit Roychowdhury1, Maia G. Vergniory1,2, Horst Borrmann1, Hans-Henning Klauss3, Claudia Felser1, and Chandra Shekhar1 — 1Max-Planck-Institute for Chemical Physics of Solids, Dresden 01187, Germany — 2Donostia International Physics Center, Donostia-San Sebastián 20018, Spain — 3Institute for Solid State and Materials Physics, Technische Universität Dresden, Dresden 01069, Germany
The Anomalous Hall effect is a transport phenomenon in ferromagnets, which exhibit currents even in the absence of a magnetic field. Their inner magnetization breaks Time Reversal Symmetry, allowing the Berry Curvature (BC) to be finite. As a result, topological features close to the Fermi energy have a deep impact in the transport properties, leading to huge Anomalous Hall Conductivities (AHC). This has been a well-established paradigm for the last years for the linear AHC.
However, recent experimental results in the Weyl semimetals NiMnSb and PtMnSb might be pointing to something beyond it. By combining ab-initio calculations with a toy-model, we show that the steep slope-bands both compounds exhibit are capable of dragging the BC originated in Weyl nodes far away from the Fermi level, leading to a huge AHC in these compounds. We propose that this dragging effect of the BC can be generalized to the other materials exhibiting this band structure behaviour, which enrichens the paradigm described above. Further research in this direction is currently being done.