Quadrupolar and dipolar excitons in symmetric trilayer heterostructures: Insights from first principles theory
arXiv:2406.09809 · doi:10.1088/2053-1583/ad5739
Abstract
Excitons in van der Waals heterostructures come in many different forms. In bilayer structures, the electron and hole may be localized on the same layer or they may be separated forming an interlayer exciton with a finite out-of-plane dipole moment. Using first principles calculations, we investigate the excitons in a symmetric WS/MoS/WS heterostructure in the presence of a vertical electric field. The excitons exhibit a quadratic Stark shift for low field strengths and a linear Stark shift for stronger fields. This behaviour is traced to the coupling of interlayer excitons with opposite dipole moments, which lead to the formation of quadrupolar excitons at small fields. The formation of quadrupolar excitons is determined by the relative size of the electric field-induced splitting of the dipolar excitons and the coupling between them given by the hole tunneling across the MoS layer. For the inverted structure, MoS/WS/MoS, the dipolar excitons are coupled by electron tunneling across the WS layer. Because this effect is much weaker, the resulting quadrupolar excitons are more fragile and break at a weaker electric field.
References in corpus (24)
- Van der Waals heterostructures
- Exciton Binding Energy and Nonhydrogenic Rydberg Series in Monolayer WS2
- Ultrafast Charge Transfer in Atomically Thin MoS2/WS2 Heterostructures
- Excitons in atomically thin transition metal dichalcogenides
- Observation of Long-Lived Interlayer Excitons in Monolayer MoSe2-WSe2 Heterostructures
- Optical Spectrum of MoS: Many-body Effects and Diversity of Exciton States
- The Computational 2D Materials Database: High-Throughput Modeling and Discovery of Atomically Thin Crystals
- Electronic properties of the MoS2-WS2 heterojunction
- Magnetic brightening and control of dark excitons in monolayer WSe2
- Splitting between Bright and Dark excitons in Transition Metal Dichalcogenide Monolayers
- Brightening of dark excitons in monolayers of semiconducting transition metal dichalcogenides
- Dipolar interactions between field-tuneable, localized emitters in van der Waals heterostructures
- Giant Stark splitting of an exciton in bilayer MoS
- Inter- and intra-layer excitons in MoS/WS and MoSe/WSe heterobilayers
- Discrete Interactions between a few Interlayer Excitons Trapped at a MoSe-WSe Heterointerface
- Localized bright luminescence of indirect excitons and trions in MoSe/WSe van der Waals heterostructure
- Electronic Excitations from a Perturbative LDA+GdW Approach
- Dipolar and magnetic properties of strongly absorbing hybrid interlayer excitons in pristine bilayer MoS
- Quadrupolar Excitons and Hybridized Interlayer Mott Insulator in a Trilayer Moiré Superlattice
- Quantum phase transitions of tri-layer excitons in atomically thin heterostructures
- Evidence for Exciton Crystals in a 2D Semiconductor Heterotrilayer
- Light-matter interaction in van der Waals heterostructures
- Quantum phase transition of a two-dimensional quadrupolar system
- Pressure dependence of intra- and interlayer excitons in 2H-MoS bilayers