Berlin 2024 – wissenschaftliches Programm

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DS: Fachverband Dünne Schichten

DS 2: 2D Materials and their Heterostructures I: hBN, WSe2, MoS2

DS 2.8: Vortrag

Montag, 18. März 2024, 11:30–11:45, A 060

Light-Matter coupling in Van der Waals heterostructures — •Bharti Parashar, Mathias Federolf, Atanu Patra, Vishakha Kaushik, and Sven Höfling — Technische Physik, University of Würzburg, Am Hubland 97074 Würzburg Germany

Transition metal dichalcogenides (TMDCs) heterostructures (HSs) offer a dynamic platform where artificially stacked monolayers of different TMDCs materials may reveal intriguing quantum behaviors. The alignment or twist between these monolayers generates a periodic moiré pattern, endowing the presence of the quasi-particle intralayer exciton, within the same material and an interlayer exciton characterized by charge carriers originating from different monolayers. Moiré superlattices in two-dimensional (2D) HSs induce quantum phenomena by fundamentally altering the electronic hybridizations by controlling the twist angle between atomically thin layers. This paradigm shift provides a unique avenue for precisely tailoring interactions between quantum particles and their coupling to electromagnetic fields. Moreover, beyond their discernible effects on single-particle states, strong moiré superlattices manifest excited states, such as the formation of moiré minibands of excitons [1]. In this study, we comprehensively explore the optoelectronic characteristics of twisted WSe2/WS2 van der Waals HSs. The insights obtained contribute to establishing a foundational understanding essential for realizing many-body states in moiré superlattices, such as exciton condensates, and bosonic insulating states via electric field manipulation.

Ref: [1] Jin, Chenhao, et al. Nature 567.7746 (2019): 76-80

Keywords: 2D TMDCs; Heterostructures; Moiré superlattices