Berlin 2024 – scientific programme
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TT: Fachverband Tiefe Temperaturen
TT 38: Topological Semimetals I
TT 38.1: Talk
Wednesday, March 20, 2024, 09:30–09:45, H 3010
Anomalous Nernst effect in the topological and magnetic material MnBi4Te7 — •Michele Ceccardi1,2, Alexander Zeugner3, Laura Folkers3,4, Christian Hess3,4,5, Bernard Buechner3,4, Daniele Marré1,2, Anna Isaeva4,6, and Federico Caglieris1,2,4 — 1University of Genoa, Italy — 2CNR Spin; Genoa, Italy — 3TU Dresden, Germany — 4IFW Dresden, Germany — 5University of Wuppertal, Germany — 6University of Amsterdam, Nederland
The recently discovered magnetic topological insulators (MnBi2Te4)(Bi2Te3)n, n = 0-4, are an ideal playground to study the influence of magnetic properties on band topology, giving access to diverse quantum states in a single compound. In the low temperature-antiferromagnetic state and vanishing magnetic field, the n = 1 system is a topological insulator protected by a combination of time reversal and a translation symmetries. It has been argued that, when the antiferromagnetic phase is forced to a the fully spin polarized state by the application of an external magnetic field, this system develops Weyl cones in the conduction band, which become accessible in presence of an intrinsic electronic doping. In this work, we experimentally prove the raising of field-induced Weyl state through the detection of an intrinsic anomalous Nernst effect in a bulk single crystal of MnBi4Te7.
Keywords: Weyl semimetals; Nernst effect; Magnetic topological insulators