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HL: Fachverband Halbleiterphysik

HL 13: Poster Session I

HL 13.16: Poster

Monday, March 12, 2018, 17:30–19:30, Poster B

Determination of the crystal orientation of monolayer transition metal dichalcogenides and transition metal dichalcogenide heterostructures. — •Michael Kempf, Johannes Holler, Philipp Nagler, Christian Schüller, and Tobias Korn — Universität Regensburg, 93053 Regensburg Germany

We investigate the crystal orientation of monolayer transition metal dichalcogenides (TMDC) and especially the relative crystal orientation of single layer TMDC heterostructures. This difference is of special interest for interlayer effects, for example the formation and recombination of interlayer excitons, and can be determined by using polarized second harmonic generation (SHG) measurements. The heterostructure samples are fashioned through mechanical exfoliation of monolayer MoSe₂ and WSe₂ and stepwise transfer onto a SiO₂ substrate. We perform scanning SHG measurements of our structures with sub-µm resolution and defined polarization. For a 0^∘ and 60^∘ orientation difference of the monolayers in a heterostructure we observe a constructive and destructive interference of the SHG intensity, respectively.