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Interlayer Trions in the MoS2/WS2 van der Waals Heterostructure
Thorsten Deilmann1, Kristian Sommer Thygesen1,2
1CAMD, Department of Physics, Technical University of Denmark , DK-2800 Kongens Lyngby, Denmark.
Nano Letters
|January 30, 2018
Summary
Researchers discovered bound interlayer trions in MoS2/WS2 heterostructures, advancing the understanding of electronic excitations and optical properties in doped van der Waals materials.
Area of Science:
- Condensed Matter Physics
- Materials Science
- Quantum Chemistry
Background:
- Electronic excitations in van der Waals heterostructures exhibit interlayer or intralayer character.
- Excitons (neutral electron-hole pairs) have been extensively studied, but charged trions were limited to intralayer types.
- Understanding charged excitations is crucial for novel electronic and optoelectronic devices.
Purpose of the Study:
- To investigate interlayer excitonic and trionic excitations in MoS2/WS2 heterostructures.
- To explore the existence and properties of charged interlayer trions.
- To provide a consistent theoretical framework for both excitons and trions.
Main Methods:
- Utilized a novel ab initio method for consistent treatment of excitons and trions.
- Calculated binding energies for various interlayer trion configurations.
- Analyzed the spatial localization of charges in MoS2/WS2 heterostructures.
Main Results:
- Predicted the existence of bound interlayer trions below neutral interlayer excitons.
- Obtained binding energies of 18 meV for positive and 28 meV for negative interlayer trions.
- Found negligible binding energy for interlayer trions with charges on different layers.
Conclusions:
- Demonstrated the existence of stable bound interlayer trions in MoS2/WS2 heterostructures.
- Advanced the understanding of electronic excitations in doped van der Waals heterostructures.
- Highlighted the impact of interlayer trions on the optical properties of these materials.
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