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Open Access Publications from the University of California

Revealing exciton masses and dielectric properties of monolayer semiconductors with high magnetic fields.

  • Author(s): Goryca, M;
  • Li, J;
  • Stier, AV;
  • Taniguchi, T;
  • Watanabe, K;
  • Courtade, E;
  • Shree, S;
  • Robert, C;
  • Urbaszek, B;
  • Marie, X;
  • Crooker, SA
  • et al.

In semiconductor physics, many essential optoelectronic material parameters can be experimentally revealed via optical spectroscopy in sufficiently large magnetic fields. For monolayer transition-metal dichalcogenide semiconductors, this field scale is substantial-tens of teslas or more-due to heavy carrier masses and huge exciton binding energies. Here we report absorption spectroscopy of monolayer [Formula: see text], and [Formula: see text] in very high magnetic fields to 91 T. We follow the diamagnetic shifts and valley Zeeman splittings of not only the exciton's [Formula: see text] ground state but also its excited [Formula: see text] Rydberg states. This provides a direct experimental measure of the effective (reduced) exciton masses and dielectric properties. Exciton binding energies, exciton radii, and free-particle bandgaps are also determined. The measured exciton masses are heavier than theoretically predicted, especially for Mo-based monolayers. These results provide essential and quantitative parameters for the rational design of opto-electronic van der Waals heterostructures incorporating 2D semiconductors.

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