Dresden 2026 – scientific programme
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O: Fachverband Oberflächenphysik
O 76: Electronic structure of surfaces: Spectroscopy, surface states II
O 76.4: Talk
Thursday, March 12, 2026, 11:15–11:30, HSZ/0201
electronic properties observation of kagome lattice Nb3X8 by angle-resolved photoemission spectroscopy — •Xiaojing Liu1, Antonija Grubisic-cabo1, Joost aretz Aretz2, Sergii Grytsiuk2, Marco Bianchi3, Malte Rosner2,4, Mazhar Ali5, Philip Hofmann3, Zhiying Dan1, Giovanna Feraco1, Chrystalla Knekna1,6, Muhammad Waseem1, and Mikhail Katsnelson2,7 — 1University of Groningen, Groningen, The Netherlands — 2Radboud University, Nijmegen, The Netherlands — 3Aarhus University, Aarhus, Denmark — 4Bielefeld University, Bielefeld, Germany — 5Delft University of Technology, Delft, the Netherlands — 6University of Amsterdam, Amsterdam, The Netherlands — 7Constructor University, Bremen, Germany
The Nb3X8 family (X=Cl, Br, I) is a novel group of breathing kagome materials. Despite interest in these materials, their electronic properties are still unclear and are likely to differ among the family members. For instance, they could exhibit characteristics of either a strongly correlated Mott insulator or a weakly correlated obstructed atomic insulator. Moreover, the kagome lattice can naturally host flat bands, which give rise to exotic properties such as spin-liquids and high-temperature superconductivity. Here, I will present our recent experimental investigation of the band structure in bulk Nb3X8 kagome materials by means of angle-resolved photoemission spectroscopy (ARPES). With ARPES we directly image the flat bands in the Nb3X8 systems, and are able to verify their strong correlation character with the support of theoretical calculations.
Keywords: angle-resolved photoemission spectroscopy; Strong correlation materials; Nb3X8; flat band