Seminar: Ultrafast magnetism in the 2D semiconductor ferromagnet CrI3

  • Date: –12:30
  • Location: Ångströmlaboratoriet, Lägerhyddsvägen 1 Å92110
  • Lecturer: Vishal Shokeen
  • Organiser: Division of Materials Theory, Department of Physics and Astronomy
  • Contact person: Jorge Cayao
  • Seminarium

Abstract: Femtosecond laser induced spin dynamics in magnets exhibits a rich diversity of the underlying physical processes. Generally, it is explained by the mutual interaction among different degrees of freedom including electrons, spins and lattice [1]. With the advent of van der Waals bonded layered ferromagnetic materials possessing strong light matter interactions, it presents an interesting opportunity to control spin dynamics with ultrafast lasers [2] in 2D systems. Here, we investigate CrI3, a semiconducting 2D ferromagnet with optical and magneto-optical properties that are dominated by excitons and charge transfer processes [3]. We use time resolved magneto-optical technique with a cryostat in FREIA laser lab to observe the dynamics in CrI3 below its Tc~61 K. We will discuss the role of fs pulse excited excitons, coherent phonons and polaron hopping altering the exchange interactions in CrI3 after laser excitation.


1. Tauchert et. al. Nature 602, 73 (2022)

2. Padmanabhan et. al., Nature Communications 13, 4473 (2022)

3. Xufeng Li et al., Nano Lett. 22, 8755 (2022)

Last modified: 2022-12-12