Berlin 2024 – wissenschaftliches Programm
Bereiche | Tage | Auswahl | Suche | Aktualisierungen | Downloads | Hilfe
TT: Fachverband Tiefe Temperaturen
TT 13: Kagome Systems
TT 13.7: Vortrag
Montag, 18. März 2024, 16:45–17:00, H 3010
Visualizing many body phases in a partially filled kagome flat band — Caiyun Chen, Jiangchang Zheng, Yuman He, Ruopeng Yu, Soumya Sankar, Kam Tuen Law, Hoi Chun Po, and •Berthold Jäck — HKUST, Department of Physics, Clear Water Bay, Kowloon, Hong Kong SAR, China
The kagome lattice with spin-orbit coupling exhibits a topologically non-trivial flat band in which the effect of Coulomb interactions between the localized charge carriers is believed to be strong. Hence, material realizations of the kagome lattice provide a promising platform to search for new quantum phases of matter at the confluence of topology and strong electronic correlations. We previously showed that the kagome metal CoSn exhibits a quasi-two-dimensional flat band whose occupied electronic states are strongly localised in real space [1].
Here, we study the low energy density of states of Co1−xFexSn in which partial flat band fillings are realised by hole-doping with Fe. We will present results from temperature-dependent scanning tunnelling microscopy measurements on Co1−xFexSn. Combining high-resolution spectroscopy with spectroscopic imaging on samples with different doping levels x, we observe a rich sequence of states appearing at the Fermi energy that cannot be explained within a single-particle picture. We will discuss our findings in the context of electron-electron interaction induced many body states at partial flat band fillings.
We gratefully acknowledge support by the Hong Kong RGC and the Croucher Foundation.
[1] C. Chen et al., arXiv:2308.08976 (2023)
Keywords: Kagome metal; Scanning Tunneling Microscopy; Flat Band; Electronic correlations; Charge order