Dresden 2020 – wissenschaftliches Programm
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SYES 2.3: Hauptvortrag
Donnerstag, 19. März 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 . 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 , 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.
 R. Gillen and J. Maultzsch, Phys. Rev. B 97 (2018), pp. 165306.  S. Wolff, R. Gillen, M. Assebban, G. Abellán, J. Maultzsch, https://arxiv.org/abs/1909.01204