Stark Effect Spectroscopy of Mono- and Few-Layer MoS2.
basic_science · Level V
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- Record sourced from PubMed, PMID 26845085.
- Also identified by DOI 10.1021/acs.nanolett.5b03954.
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Abstract
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 ⟨β̅N⟩ = (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.