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Unusual electronic excitations in ABA trilayer graphene
Chiun-Yan Lin1, Ching-Hong Ho1,2, Jhao-Ying Wu3
1Department of Physics, National Cheng Kung University, Tainan, Taiwan.
Scientific Reports
|July 8, 2020
Summary
This study explores electron interactions in trilayer graphene using a tight-binding model. It reveals three plasmon modes and complex excitations influenced by doping and layer number.
Area of Science:
- Condensed Matter Physics
- Materials Science
Background:
- Electron-electron interactions are crucial in low-dimensional materials.
- Graphene's unique electronic properties make it a key research area.
Purpose of the Study:
- To investigate electron-electron interactions in trilayer AB-stacked graphene.
- To analyze collective and electron-hole excitations.
- To understand the influence of atomic and Coulomb interactions.
Main Methods:
- Utilized the tight-binding model.
- Employed the modified random-phase approximation.
- Analyzed transferred momentum-frequency phase diagrams.
Main Results:
- Identified three distinct plasmon modes across varying doping levels.
- Observed complex intraband and interband single-particle excitations.
- Demonstrated that excitation behaviors are layer-number dependent.
Conclusions:
- Trilayer graphene exhibits diverse excitation behaviors.
- Theoretical predictions highlight the need for high-resolution experimental validation.
