Young-Woo Son, Korea Institute for Advanced Study

"Roles of interactions in stacked two dimensional crystals"

Abstract: In this talk, I will discuss critical roles of strong interactions in two-dimensional (2D) crystals and their stacked structures. In 2D crystals, strong interactions between electrons or between electrons and lattices often result in qualitatively different electronic, structural and optical properties. Moreover, these materials can be artificially controlled very well such that their thickness or stacking faults can be engineered to demonstrate new physics. So, for each case, a new set of theoretical tools often need to be developed to explain or predict their distinct properties. Novel physical quantities presented in this talk will include anomalous magnetic exciton[1], preformed charge density wave states [2], whirlpool structures [3] as well as weak quasicrystals [4].

[1] S. Kang et al. Nature 583, 785 (2020).
[2] C. Park and Y.-W. Son, arXiv:2303.08598 (2023).
[3] J. Kim et al., Nature Materials 21, 890 (2022).
[4] S. J. Ahn et al., Science 361, 782 (2018).