Research interests

In the Quantum Matter group, we are interested in the coupled optical, electronic and magnetic properties of two-dimensional (2D) quantum materials. These 2D materials can be exfoliated with scotch tape down to the monolayer limit and can be stacked together mechanically to fabricate arbitrary heterostructures. We are in particular interested in exciton physics in 2D semiconductors at low temperatures (around 4 K). Layers of different quantum materials interact via moiré and proximity effects. We investigate these heterostructures of 2D semiconductors using low-temperature magneto-optical spectroscopy with control parameters such as magnetic field, electrical field, doping, temperature, excitation power and wavelength.  

Currently, we are particularly interested in the 2D magnetic semiconductor CrSBr, in which the excitons are coupled to the magnetic order and to magnons.

Check out our recent work:

• F. Tabataba-Vakili, L. Krelle, L. Husel, H. P. G. Nguyen, Z. Li, I. Bilgin, K. Watanabe, T. Taniguchi, A. Högele
  Metasurface of strongly coupled excitons and plasmonic arrays
  Nano Lett. 24, 10090 (2024)
  https://doi.org/10.1021/acs.nanolett.4c02043
   
• F. Tabataba-Vakili, H. P. G. Nguyen, A. Rupp, K. Mosina, A. Papavasileiou, K. Watanabe, T. Taniguchi, P. Maletinsky, M. M. Glazov, Z. Sofer, A. S. Baimuratov, and A. Högele
  Doping-control of excitons and magnetism in few-layer CrSBr
  Nat. Commun. 15, 4735 (2024)
  https://doi.org/10.1038/s41467-024-49048-9
• Z. Li, F. Tabataba-Vakili, S. Zhao, A. Rupp, I. Bilgin, Z. Herdegen, B. März, K. Watanabe, T. Taniguchi, G. R. Schleder, A. S. Baimuratov, E. Kaxiras, K. Müller-Caspary, and A. Högele
  Lattice reconstruction in MoSe₂-WSe₂ heterobilayers synthesized by chemical vapor deposition
  Nano Lett. 23, 4160 (2023)
  https://doi.org/10.1021/acs.nanolett.2c05094