2022/03/03 by Chandan Setty, Setty, Chandan, Christopher Lane +9 · 1 citation
Engineering · Physics and Astronomy · #FOS: Physical sciences #Geophysics and Sensor Technology #Materials Science (cond-mat.mtrl-sci) #Mesoscale and Nanoscale Physics (cond-mat.mes-hall) #Quantum, superfluid, helium dynamics #Strongly Correlated Electrons (cond-mat.str-el) #Topological Materials and Phenomena
paper · pdf · doi:10.48550/arxiv.2203.01930
openalex publication_date 2022/03/03 · openalex created_date 2022/04/03 · openalex updated_date 2026/07/28
Charge order in kagome metals is of extensive current interest. Recently, a charge density wave was discovered in the magnetic binary kagome metal FeGe. In analogy to its predecessor, the non-magnetic AV3Sb5 (A=K, Cs, Rb), the in-plane ordering occurs at the M point. In contrast, however, the system manifestly shows effects of substantial correlations. Here we identify the topological bands crossing the Fermi energy (EF) in FeGe and characterize the correlation-induced renormalization of these bands. We then derive a charge order from an effective model comprising topological kagome `flat' bands in the presence of a magnetic order. We demonstrate edge states as well as excess out-of-plane magnetic moment associated with the charge order; both are fingerprints of non-trivial band topology and consistent with recent experimental observations. Our results point to FeGe as an ideal platform to realize and elucidate correlated topological physics.