Stark Effect Spectroscopy of Mono- and Few-Layer MoS2

We demonstrate electrical control of the A-exciton interband transition in mono- and few-layer MoS2 crystals embedded into photocapacitor devices via the DC Stark effect. Electric field-dependent low-temperature photoluminescence spectroscopy reveals a significant tuneability of the A-exciton transi...

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Bibliographic Details
Published in:Nano letters 2016-03, Vol.16 (3), p.1554-1559
Main Authors: Klein, J, Wierzbowski, J, Regler, A, Becker, J, Heimbach, F, Müller, K, Kaniber, M, Finley, J. J
Format: Article
Language:English
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Summary:We demonstrate electrical control of the A-exciton interband transition in mono- and few-layer MoS2 crystals embedded into photocapacitor devices via the DC Stark effect. Electric field-dependent low-temperature photoluminescence spectroscopy reveals a significant tuneability of the A-exciton transition energy up to ∼16 meV from which we extract the mean DC exciton polarizability ⟨β̅ N ⟩ = (0.58 ± 0.25) × 10–8 Dm V–1. The exciton polarizability is shown to be layer-independent, indicating a strong localization of both electron and hole wave functions in each individual layer.
ISSN:1530-6984
1530-6992
DOI:10.1021/acs.nanolett.5b03954