Regensburg 2022 – scientific programme
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TT: Fachverband Tiefe Temperaturen
TT 25: Topological Semimetals
TT 25.5: Talk
Thursday, September 8, 2022, 10:45–11:00, H3
Control of topological nodal planes in MnSi — •Marc A. Wilde1,2, Matthias Dodenhöft1, Arthur Niedermayr1, Andreas Bauer1,2, Moritz M. Hirschmann3, Kirill Alpin3, Andreas P. Schnyder3, and Christian Pfleiderer1,2,4 — 1Physik Department, Technische Universität München, Garching, Germany — 2Center for QuantumEngineering (ZQE), Technische Universität München, Garching, Germany — 3Max Planck Institute for Solid State Research, Stuttgart, Germany — 4MCQST, Technische Universität München, Garching, Germany
Topologically protected band crossings occurring at points or along lines in reciprocal space have generated widespread interest. In contrast, the existence of entire surfaces on which bands are forced to cross and which can also carry a topological charge has been largely overlooked. This is especially intriguing, since (i) the conditions required for the crossing to occur exactly at the Fermi levels are dramatically relaxed by the two-dimensional nature of the planes and (ii) the reciprocal space separation between partner charges is maximal.
In the field-polarized phase of the chiral magnet MnSi the existence or absence of such topological nodal planes is enforced by the existence of absence of magnetic screw rotation symmetries. By using a combination of symmetry analysis, density functional theory and de Haas-van Alphen quantum oscillation experiments we demonstrate switching of the topological nodal planes by an applied magnetic field [1].
[1] M.A. Wilde et al., Nature 594, 374 (2021)