Stark effect spectroscopy of mono- and few-layer MoS${}_2$

Abstract

We demonstrate electrical control of the A-exciton interband transition in mono- and few-layer $Mo{S}_2$ 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 $\sim 16meV$, from which we extract the mean DC exciton polarisability $<\bar{\beta }{>}_N=(0.58\pm 0.25)\cdot 10^{-8}Dm{V}^{-1}$. The exciton polarisability is shown to be layer-independent, indicating a strong localisation of both electron and hole wave functions in each individual layer.

arXiv comment19 pages, 4 figures in Nano Lett. 2016

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• Suppressed out-of-plane polarizability of free excitons in monolayer WSe${}_2$
• Control of interlayer delocalization in 2H transition metal dichalcogenides
• Anomalous Stark Shift of Excitonic Complexes in Monolayer Semiconductor
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• Harmonic to anharmonic tuning of moiré potential leading to unconventional Stark effect and giant dipolar repulsion in WS${}_2$/WSe${}_2$ heterobilayer
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• Electrical control of orbital and vibrational interlayer coupling in bi- and trilayer 2H-MoS${}_2$
• Conduction modulation of solution-processed two-dimensional materials
• Electric-field-tunable intervalley excitons and phonon replicas in bilayer WSe${}_2$
• Efficient ionization of two dimensional excitons by intense single cycle terahertz pulses
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• Macroscopic electro-optical modulation of solution-processed molybdenum disulfide
• Enhanced Light Emission from the Ridge of Two-dimensional InSe Flakes