Quantum confined Stark effect in a MoS${}_2$ monolayer van der Waals heterostructure

Abstract

The optics of dangling-bond-free van der Waals heterostructures containing transition metal dichalcogenides are dominated by excitons. A crucial property of a confined exciton is the quantum confined Stark effect (QCSE). Here, such a heterostructure is used to probe the QCSE by applying a uniform vertical electric field across a molybdenum disulfide (MoS${}_2$) monolayer. The photoluminescence emission energies of the neutral and charged excitons shift quadratically with the applied electric field provided the electron density remains constant, demonstrating that the exciton can be polarized. Stark shifts corresponding to about half the homogeneous linewidth were achieved. Neutral and charged exciton polarizabilities of $(7.8~\pm~1.0)\times 10^{-10}~\tr{D~m~V}^{-1}$ and $(6.4~\pm~0.9)\times 10^{-10}~\tr{D~m~V}^{-1}$ at relatively low electron density ($8 \times 10^{11}~\tr{cm}^{-2}$) have been extracted, respectively. These values are one order of magnitude lower than the previously reported values, but in line with theoretical calculations. The methodology presented here is versatile and can be applied to other semiconducting layered materials as well.

References in corpus (14)

• Atomically thin MoS2: A new direct-gap semiconductor
• Van der Waals heterostructures
• 2D materials and van der Waals heterostructures
• Observation of tightly bound trions in monolayer MoS2
• Exciton Binding Energy and Nonhydrogenic Rydberg Series in Monolayer WS2
• Observation of Long-Lived Interlayer Excitons in Monolayer MoSe2-WSe2 Heterostructures
• Excitonic linewidth approaching the homogeneous limit in MoS2 based van der Waals heterostructures : accessing spin-valley dynamics
• Fermi polaron-polaritons in charge-tunable atomically thin semiconductors
• Fast pick up technique for high quality heterostructures of bilayer graphene and hexagonal boron nitride
• Photo-induced Doping in Graphene/Boron Nitride Heterostructures
• Many-Body Theory of Trion Absorption Features in Two-Dimensional Semiconductors
• Stark effect spectroscopy of mono- and few-layer MoS${}_2$
• Excitonic Stark effect in MoS${}_2$ monolayers
• Quantum transport through MoS${}_2$ constrictions defined by photodoping

Cited by in corpus (25)

• Giant Stark splitting of an exciton in bilayer MoS${}_2$
• The ultrafast onset of exciton formation in 2D semiconductors
• Electronic polarizability as the fundamental variable in the dielectric properties of two-dimensional materials
• Accessing high optical quality of MoS2 monolayers grown by chemical vapor deposition
• Coulomb blockade in an atomically thin quantum dot coupled to a tunable Fermi reservoir
• Ultra-thin van der Waals crystals as semiconductor quantum wells
• Dielectrics for Two-Dimensional Transition Metal Dichalcogenide Applications
• Electrical control of lifetime-limited quantum emitters using 2D materials
• Interfacial bound exciton state in a hybrid structure of monolayer WS2 and InGaN quantum dots
• Suppressed out-of-plane polarizability of free excitons in monolayer WSe${}_2$
• Anomalous Stark Shift of Excitonic Complexes in Monolayer Semiconductor
• Tuning of impurity-bound interlayer complexes in a van der Waals heterobilayer
• Signatures of electric field and layer separation effects on the spin-valley physics of MoSe${}_2$/WSe${}_2$ heterobilayers: from energy bands to dipolar excitons
• Interplay of Excitonic Complexes in $p$-Doped WSe${}_2$ Monolayers
• Capacitively-coupled and inductively-coupled excitons in bilayer MoS${}_2$
• Enhanced exciton-exciton collisions in an ultra-flat monolayer MoSe2 prepared through deterministic flattening
• Dipolar and charged localized excitons in carbon nanotubes
• Terahertz field effect in a two-dimensional semiconductor MoS2
• Doping-induced non-Markovian interference causes excitonic linewidth broadening in monolayer WSe${}_2$
• Magneto-Optical Measurements of the Negatively Charged 2$s$ Exciton in WSe${}_2$
• Current-induced brightening of vacancy-related emitters in hexagonal boron nitride
• Highly tunable quantum light from moiré trapped excitons
• Electrical Control of Excitons in Bare-MoSe2 and MoSe2/NbSe2 Heterostructure
• Interlayer exciton mediated second harmonic generation in bilayer MoS2
• Enhanced Light Emission from the Ridge of Two-dimensional InSe Flakes