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Light-induced irreversible structural phase transition in trilayer graphene
Jianyu Zhang1, Jinsen Han1, Gang Peng1
1Department of Physics, National University of Defense Technology, 410073 Changsha, China.
Light, Science & Applications
|October 21, 2020
Summary
Researchers demonstrate laser-induced phase switching in trilayer graphene, enabling precise control over domain walls and local properties. This breakthrough offers a new method for engineering artificial 2D materials with tailored atomic structures and functionalities.
Area of Science:
- Materials Science
- Condensed Matter Physics
- Nanotechnology
Background:
- Crystal structure dictates material properties, with dynamic phase changes offering advanced functionalities.
- Trilayer graphene exhibits distinct ABA and ABC stacking configurations with unique electronic properties.
- Domain walls in trilayer graphene host novel physics like the quantum valley Hall effect, but precise manipulation remains challenging.
Purpose of the Study:
- To experimentally demonstrate precise control over structural phase transitions in trilayer graphene.
- To investigate the creation and manipulation of domain walls using external stimuli.
- To explore the potential for engineering artificial 2D materials with designed properties.
Main Methods:
- Utilizing laser irradiation as an external stimulus to induce phase switching in trilayer graphene.
- Creating and controlling domains of varying shapes and orientations.
- Analyzing the impact of domain wall manipulation on local structural phases and material properties.
Main Results:
- Successfully induced reversible phase switching between different structural configurations in trilayer graphene via laser irradiation.
- Demonstrated precise control over the position and orientation of domain walls.
- Established a correlation between domain wall characteristics and local electronic/optical properties.
Conclusions:
- Laser irradiation provides an effective method for dynamic phase engineering in trilayer graphene.
- Controlled manipulation of domain walls allows for fine-tuning of local material properties.
- This approach offers a versatile platform for creating custom artificial 2D materials.
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