Dresden 2026 – wissenschaftliches Programm
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HL: Fachverband Halbleiterphysik
HL 14: Focus Session: Tunable Correlations in van der Waals Quantum Materials II (joint session TT/DS/HL)
HL 14.4: Vortrag
Dienstag, 10. März 2026, 10:30–10:45, HSZ/0105
Chemically Tunable Correlation Strength in Breathing Mode Kagome van der Waals Materials Nb3(F,Cl,Br,I)8 — •Joost Aretz1, Sergii Grytsiuk1, Xiaojing Liu2, Giovanna Feraco2, Chrystalla Knekna2,3, Muhammad Waseem2, Zhiying Dan2, Marco Bianchi4, Philip Hofmann4, Mazhar Ali5, Mikhail Katsnelson1,6, Antonija Grubišić-Čabo2, Hugo Strand7, Erik van Loon8, and Malte Rösner1,9 — 1Radboud University, Nijmegen, Netherlands — 2University of Groningen, Netherlands — 3University of Amsterdam, Netherlands — 4Aarhus University, Denmark — 5Delft University of Technology, Netherlands — 6Constructor University, Bremen, Germany — 7Örebro University, Sweden — 8Lund University, Sweden — 9Bielefeld University, Germany
Finding tunable correlated electron systems in nature is highly desirable for studying strongly correlated materials. Our recent work demonstrates that the Nb3X8-family offers such a platform for tuning correlation effects in van der Waals systems. By using ab initio downfolding and cluster dynamical mean-field theory we show how correlation effects evolve across the halide series. In these materials an intruiging interplay between in-plane trimerization and out-of-plane dimerization leads to correlated insulating behavior, where the strength of correlations can be tuned by switching the halide or by changing the layer number. The predicted trends are supported by ARPES measurements. The correlated electron physics in this system is robust, tunable and layered, which allows studying the role of correlations in devices such as the NbSe2/Nb3Br8 Josephson diode.
Keywords: Material-specific Modeling; Tunable Correlations; van der Waals materials; ARPES