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TT: Fachverband Tiefe Temperaturen

TT 38: Topological Semimetals I

TT 38.1: Vortrag

Mittwoch, 20. März 2024, 09:30–09:45, H 3010

Anomalous Nernst effect in the topological and magnetic material MnBi₄Te₇ — •Michele Ceccardi^1,2, Alexander Zeugner³, Laura Folkers^3,4, Christian Hess^3,4,5, Bernard Buechner^3,4, Daniele Marré^1,2, Anna Isaeva^4,6, and Federico Caglieris^1,2,4 — 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