Electroabsorption in MoS${}_2$

Abstract

To translate electrical into optical signals one uses the modulation of either the refractive index or the absorbance of a material by an electric field. Contemporary electroabsorption modulators (EAMs) employ the quantum confined Stark effect (QCSE), the field-induced red-shift and broadening of the strong excitonic absorption resonances characteristic of low-dimensional semiconductor structures. Here we show an unprecedentedly strong transverse electroabsorption (EA) signal in a monolayer of the two-dimensional semiconductor MoS2. The EA spectrum is dominated by an apparent linewidth broadening of around 15% at a modulated voltage of only Vpp = 0.5 V. Contrary to the conventional QCSE, the signal increases linearly with the applied field strength and arises from a linear variation of the distance between the strongly overlapping exciton and trion resonances. The achievable modulation depths exceeding 0.1 dBnm-1 bear the scope for extremely compact, ultrafast, energy-efficient EAMs for integrated photonics, including on-chip optical communication.

References in corpus (20)

• Universal Dynamic Conductivity and Quantized Visible Opacity of Suspended Graphene
• Anomalous Lattice Vibrations of Single and Few-Layer MoS2
• Two-Dimensional Material Nanophotonics
• Observation of tightly bound trions in monolayer MoS2
• Optical modulators with two-dimensional layered materials
• Optical Generation of Excitonic Valley Coherence in Monolayer WSe2
• Strong light-matter coupling in two-dimensional atomic crystals
• Probing Excitonic Dark States in Single-layer Tungsten Disulfide
• The Nature of Electronic States in Atomically Thin MoS2 Field-Effect Transistors
• Low-temperature photocarrier dynamics in monolayer MoS2
• Valley-selective optical Stark effect in monolayer WS2
• Intrinsic Exciton Linewidth in Monolayer Transition Metal Dichalcogenides
• Electrical Control of Second-Harmonic Generation in a WSe2 Monolayer Transistor
• Why all the fuss about 2D semiconductors?
• Controlling the Spontaneous Emission Rate of Monolayer MoS${}_2$ in a Photonic Crystal Nanocavity
• Radiative Lifetimes of Excitons and Trions in Monolayers of Metal Dichalcogenide MoS2
• Antiferromagnetic critical point on graphene's honeycomb lattice: A functional renormalization group approach
• Stark effect spectroscopy of mono- and few-layer MoS${}_2$
• Photogating of mono- and few-layer MoS2
• Charge photogeneration in few-layer MoS2

Cited by in corpus (7)

• Opportunities in Electrically Tunable 2D Materials Beyond Graphene: Recent Progress and Future Outlook
• Thermal light emission from monolayer MoS2
• Microheater actuators as a versatile platform for strain engineering in 2D materials
• Room Temperature Terahertz Electroabsorption Modulation by Excitons in Monolayer Transition Metal Dichalcogenides
• Elastomeric waveguide on-chip coupling of an encapsulated MoS${}_2$ monolayer
• Dipolar and charged localized excitons in carbon nanotubes
• Room-Temperature Quantum-Confined Stark Effect in Atomically Thin Semiconductor