Hosted by: Brad Ramshaw and Katja Nowack

Title: Designing topological electronic states on the kagome lattice

Abstract: The kagome lattice has long been known to theoretically harbor Dirac dispersions together with a dispersionless (flat) band. The experimental relevance of the kagome lattice model in the context of electronic structures has recently been established in a class of binary hexagonal iron stannides, where Dirac dispersions derived from Fe 3d electrons are observed at the Brillouin zone corners in photoemission studies [1,2]. In this talk I will focus on transport and thermodynamic measurements of the Dirac electrons in these iron-based kagome metals including ferromagnetic Fe3Sn2 and antiferromagnetic FeSn [1-3]. I will discuss the impact of crystallographic stacking and magnetic order on the lattice-derived Dirac electronic states, and the implications on future design of topological electronic states on the kagome lattice.  

POSTER

References:

[1] L. Ye, M. Kang et al., Nature 555 638-642 (2018).

[2] M. Kang, L. Ye et al., arXiv/1906.02167, Nat. Mater. (in press).

[3] L. Ye et al., Nat. Comm. 10, 4870 (2019).