Flatbands and Emergent Ferromagnetic Ordering in Fe_{3}Sn_{2} Kagome Lattices

Physical Review Letters
Zhiyong LinZhenyu Zhang

Abstract

A flatband representing a highly degenerate and dispersionless manifold state of electrons may offer unique opportunities for the emergence of exotic quantum phases. To date, definitive experimental demonstrations of flatbands remain to be accomplished in realistic materials. Here, we present the first experimental observation of a striking flatband near the Fermi level in the layered Fe_{3}Sn_{2} crystal consisting of two Fe kagome lattices separated by a Sn spacing layer. The band flatness is attributed to the local destructive interferences of Bloch wave functions within the kagome lattices, as confirmed through theoretical calculations and modelings. We also establish high-temperature ferromagnetic ordering in the system and interpret the observed collective phenomenon as a consequence of the synergetic effect of electron correlation and the peculiar lattice geometry. Specifically, local spin moments formed by intramolecular exchange interaction are ferromagnetically coupled through a unique network of the hexagonal units in the kagome lattice. Our findings have important implications to exploit emergent flat-band physics in special lattice geometries.

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Citations

Oct 3, 2019·Physical Chemistry Chemical Physics : PCCP·F Crasto de LimaR H Miwa
Dec 11, 2019·Nature Materials·Mingu KangRiccardo Comin
Jul 24, 2020·Physical Review Letters·Santu BaidyaTanusri Saha-Dasgupta
Aug 12, 2020·Nature Communications·Mingu KangRiccardo Comin
Sep 6, 2020·Nature Communications·Jia-Xin YinM Zahid Hasan
Oct 28, 2019·Nature Communications·Linda YeJoseph G Checkelsky
Aug 17, 2020·Physical Review Letters·Songtian Sonia ZhangM Zahid Hasan
Jun 15, 2020·The Journal of Chemical Physics·X B YeB C Pan
May 6, 2019·Physical Review Letters·Long-Jing YinLin He
Jul 13, 2019·Physical Review Letters·Zeyu JiangShengbai Zhang
May 23, 2020·Physical Review Letters·Jina MaZhigang Chen
Aug 8, 2020·Nature·Jun-Won RhimBohm-Jung Yang
Jul 24, 2020·Nature·Jia-Xin YinM Zahid Hasan
Dec 4, 2020·Scientific Reports·Seunghyun ParkJe-Geun Park
May 27, 2021·Nature Communications·Man LiShancai Wang
Jun 12, 2021·Nature Materials·Yu-Xiao JiangM Zahid Hasan
Aug 19, 2020·ACS Nano·Jin TangHaifeng Du

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