Regensburg 2022 – wissenschaftliches Programm

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HL: Fachverband Halbleiterphysik

HL 25: Poster 1

HL 25.24: Poster

Mittwoch, 7. September 2022, 18:00–20:00, P2

Electrical tuning of excitonic complexes in twisted van-der-Waals heterostructures — •Barbara Rosa, Chirag Palekar, and Stephan Reitzenstein — Institute of Solid State Physics, Technische Universität Berlin, D-10623 Berlin, Germany

Moiré excitons arising from transition metal dichalcogenides (TMDs) bilayers are directly controlled by the twist angle between the monolayers[1]. Noteworthy features of that new class of excitons, such as their ultrafast formation and charger transfer, long population recombination lifetimes, and binding energy of ∼150 meV[2,3], turn TMD heterostructures into an attractive device for the study and manipulation of optical and transport properties via electrical fields. Here, we explore the ability to modulate interlayer exciton states in homo- and heterobilayers (HB) throughout electrical tuning. By fabricating TMD heterostructures using CVD and exfoliated monolayers, we study the effects of an out-of-plane applied electrical field in heterostructures with distinct twist angles. Our work aims to achieve control of optical and transport properties of interlayer excitons, which have shown energy tunability that ranges over several hundreds of meV[2,3]. Furthermore, we intend to discuss our first results in exploring light-matter interaction of an HB embedded in a photonic microcavity by electrically manipulating the Moiré excitonic response.

[1] K. L. Seyler et al., Nature 567, 66-70 (2019)

[2] A. Ciarrocchi et al. Nature Photon. 13, 131 (2019)

[3] H. Baek et al. Science Advances 6, 37 (2020)