SKM 2023 – scientific programme

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HL: Fachverband Halbleiterphysik

HL 1: 2D Materials I (joint session HL/CPP)

HL 1.6: Talk

Monday, March 27, 2023, 11:00–11:15, POT 81

Optical properties of monolayer ReSe₂ and ReS₂ — •Thorsten Deilmann — Institute of Solid State Theory, University of Münster, Germany

Rhenium-based transition metal dichalcogenides unite the fascinating characteristics of the confined in-plane physics with their reduced crystal symmetry. This paves the way for polarization-sensitive applications, such as optical logic circuits operating in the infrared spectral region.

Here, we investigate the doping-dependent optical properties of ReSe₂ and ReS₂ from first principles. Besides strong excitonic effects, recent experimental studies have reported three-particle states (i.e. trions) with trion binding energies of more than 100 meV [1,2]. Using our ab initio methods we are able to predict neutral and charged properties and find much smaller binding energies compared to experiment.

[1] Advanced Functional Materials, 10, 1905961 (2019)
[2] Applied Physics Letters 119, 113103 (2021)