Correlated Motions of Electrons, Spins, and Dipoles in 2D vdW Materials
- PC Department Seminar
- Date: Jul 22, 2025
- Time: 11:00 AM (Local Time Germany)
- Speaker: Xiaoyang Zhu
- Columbia University, New York
- Location: Building G
- Room: 2.06
- Host: Martin Wolf
- Topic: Discussion and debate formats, lectures
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].