SKM 2021 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 21: Focus Session: Topological Kagome Metals
TT 21.6: Vortrag
Donnerstag, 30. September 2021, 15:45–16:00, H7
Polarization dependent localization in layered kagome metal FeSn — •Ananya Biswas1, Frederik Bolle1, Olga Iakutkina1, Hechang Lei2, Yoshichika Onukio3, Martin Dressel1, and Ece Uykur1 — 11. Physikalisches Institut, Universität Stuttgart, D-70569 Stuttgart, Germany — 2Department of Physics, Renmin University of China, 100872 Beijing, China — 3Faculty of Science, University of Ryukyus, Japan
The roots of coexistence of Dirac bands and flat bands (from extended Hubbard Model) in kagome metals holds immense significance to study correlated electron systems. Antiferromagnetic FeSn is an ideal 2D kagome lattice having its Néel temperature TN=370K. Moments of Fe atoms are ferromagnetically ordered within the Fe-Sn kagome planes, which are separated by Sn layers along c direction where each layer is coupled antiferromagtically to the adjacent kagome planes. Thus, FeSn provides ideal platform of polarization dependent investigation based on isolated and spatially decoupled kagome planes of 2D kagome network in bulk crystals. We investigated polarization effect of low energy dynamics in FeSn through infrared spectroscopy down to 10K. Results show two distinct carriers along kagome plane, which can be realized by Drude like free carrier contribution and a pronounced localization peak. Furthermore, a more coherent transport across kagome plane is reflected in our polarization dependent optical studies.