Correlated Motions of Electrons, Spins, and Dipoles in 2D vdW Materials

PC Department Seminar
Datum: 22.07.2025
Uhrzeit: 11:00
Vortragende(r): Xiaoyang Zhu
Columbia University, New York
Ort: Building G
Raum: 2.06
Gastgeber: Martin Wolf

Correlation plays a central role in emergent phenomena. Examples include, among others, quantum ground states and collective excitations. Here, I will discuss what we can learn from time-domain views of correlation in two dimensional (2D) vdW materials. In the 2D vdW magnetic semiconductor, CrSBr, excitonic transition is found to strongly couple to magnetic order [1] and this allows the easy detection of low energy (GHz-THz) magnons by visible-NIR light [2].

In twisted bilayer MoTe₂, we apply pump-probe spectroscopy as hitherto the most sensitive probe of many-body correlation in moiré quantum matter [3] to discover a zoo of quantum phases at fractional fillings in moiré super-lattices [4]. In the 2D vdW magnetic semiconductor, NbOI₂ [5], we report the experimental discovery of a quasi-particle, the ferron, which may form the basis for new modes of information processing and control [6].

Nature Mater. 2021, 20, 1657-1663.
Nature 2022,609, 282-286.
Phys. Rev. Lett. 2024, 132, 126501.
Nature 2025, https://doi.org/10.1038/s41586-025-08954-8.
Nature Mat. 2025, https://doi.org/10.1038/s41563-025-02201-1.
arXiv preprint 2025, https://arxiv.org/abs/2505.22559.