Dresden 2026 – wissenschaftliches Programm

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HL: Fachverband Halbleiterphysik

HL 3: 2D Materials I – Excitonic properties

HL 3.2: Vortrag

Montag, 9. März 2026, 09:45–10:00, POT/0081

Intra- and Interlayer Excitons in TMDC bilayers under external influence — •Jan-Hauke Graalmann and Michael Rohlfing — University of Münster, Institute of Solid State Theory, Wilhelm-Klemm-Straße 10, 48149 Münster, Germany

External influences lead to several changes in the optical spectrum of TMDC bilayers obtained by solving the Bethe-Salpeter. We discuss both the effect of applied pressure and that of an electric field [1,2].

To get the deformation induced by applied pressure, we use Hooke’s law. In this case, our investigations show an effective shift of the intralayer A exciton whose direction depends on the stress conditions and we observe a similar behavior for the interlayer exciton, while the shift rate is smaller for the latter. Our results for the 2H-MoS₂ bilayer compare very well with available room-temperature measurements for the interlayer exciton.

An electric field applied perpendicular to the 2H-MoSe₂ bilayer does not lead to a deformation, but instead to a Stark shift of the excitons. To explain that, we focus on the lifting of the degeneracy in the band structure by breaking the symmetry of the potential.

[1] P. Steeger, J. Graalmann et al., nano Lett., 23, (2023)

[2] J. Jasiński et al., Nat Commun 16, 1382, (2025)

Keywords: TMDC bilayers; interlayer excitons; Many-body perturbation theory; Hooke's law; Stark shift