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Spontaneous layer-pseudospin domain walls in bilayer graphene
Xiao Li1, Fan Zhang2, Qian Niu3
1Department of Physics, The University of Texas at Austin, Austin, Texas 78712, USA.
Physical Review Letters
|September 27, 2014
Summary
Domain walls in bilayer graphene exhibit unique structures tied to topological order. Their thermal excitation significantly lowers the metal-insulator transition temperature, deviating from theoretical predictions.
Area of Science:
- Condensed Matter Physics
- Materials Science
- Quantum Materials
Background:
- Bilayer graphene exhibits broken symmetry states with spin and valley-dependent layer polarization.
- These states possess unique topological characteristics.
Purpose of the Study:
- To microscopically investigate the structure of domain walls in bilayer graphene.
- To understand the impact of domain walls on the metal-insulator transition temperature.
Main Methods:
- Microscopic study of domain walls in bilayer graphene.
- Analysis of domain wall structure and its relation to topological order.
Main Results:
- Domain walls possess an interesting microscopic structure linked to the topological nature of the ordered states.
- Thermal excitation of domain walls was observed.
Conclusions:
- The study reveals the intricate microscopic structure of domain walls in bilayer graphene.
- Domain wall thermal excitations reduce the metal-insulator transition temperature below mean-field predictions.
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