Dresden 2020 – scientific programme

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SYES: Symposium Spain as Guest of Honor

SYES 2: Spain as Guest of Honor II

SYES 2.3: Invited Talk

Thursday, March 19, 2020, 16:00–16:30, HSZ 01

Optical properties of 2D materials and heterostructures — •Janina Maultzsch — Department of Physics, Friedrich-Alexander-Universität Erlangen-Nürnberg, Germany

The physical properties of two-dimensional semiconductors, such as transition-metal dichalcogenides (TMDCs), can be modified through the presence of adjacent materials, as in van-der-Waals heterostructures or in covalently functionalized layers. As an example for such an interlayer interaction, we present recent results on the interlayer excitons in MoSe₂-WSe₂ and MoS₂-WSe₂ heterostructures [1]. We show that the interlayer excitons are indirect both in real space and in reciprocal space. Furthermore, we predict the structures and properties of two-dimensional antimony oxide [2], which may form if few-layer antimonene is oxidized in ambient conditions. Depending on the stoichiometry, the oxidized antimonene layers are semiconducting with band gaps between 2.0 eV and 4.9 eV. Therefore, oxidation of few-layer antimonene may result in natural heterostructures composed of semiconducting antimonene oxide and semimetallic few-layer antimonene.

[1] R. Gillen and J. Maultzsch, Phys. Rev. B 97 (2018), pp. 165306. [2] S. Wolff, R. Gillen, M. Assebban, G. Abellán, J. Maultzsch, https://arxiv.org/abs/1909.01204