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 <β¯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.
Original language | English |
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Pages (from-to) | 1554-1559 |
Number of pages | 6 |
Journal | Nano Letters |
Volume | 16 |
Issue number | 3 |
DOIs | |
State | Published - 9 Mar 2016 |
Keywords
- 2D materials
- electrical control
- exciton polarizability
- molybdenum disulfide
- quantum confined Stark effect
- transition metal dichalcogenides