SKM 2023 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 12: Topological Insulators (joint session MA/TT)

TT 12.4: Vortrag

Montag, 27. März 2023, 15:45–16:00, HSZ 403

Mapping out the topological phase diagram of FeSn — Soumya Sankar¹, Ruizi Liu², Xuejian Gao¹, Qifang Li^3,4, JiaChang Zheng¹, Caiyun Chen¹, Chengping Zhang¹, Kun Qiang², Zi Yang Meng^3,4, Kam Tuen Law¹, Qiming Shao^1,2, and •Berthold Jäck¹ — ¹HKUST, Clear Water Bay, Kowloon, Hong Kong SAR — ²HKUST, Department of Computer Science and Electrical Enginerring, Clear Water Bay, Kowloon, Hong Kong SAR — ³Hong Kong University, Department of Physics, Pokfulam Road, Hong Kong SAR — ⁴University of Tokyo, Department of Physics, Hongo, Bunkyo City, Tokyo

Metallic kagome magnets exhibit a flat band and a Dirac point in their electronic structure and long-range magnetic order. The combination of these properties creates favourable conditions to search for strongly correlated and topological electronic states. The near-ideal kagome band structure of the inter metallic kagome series X1Y1 offers opportunities to study the interplay between strong electronic correlations, topology, and magnetism.

We have used molecular beam epitaxy and electronic transport measurements to study the interplay of magnetism and band topology in thin films of antiferromagnetic FeSn. We will present results from a magnetic field and temperature dependent study of the anomalous Hall effect. Combining these measurements with magnetic Monte-Carlo simulations and theoretical model calculations, we map out the topological phase diagram of FeSn over a large temperature range.

We acknowledge support by the GRC, and the Croucher Foundation.