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Updated: Jun 7, 2025
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Sputter Growth and Characterization of Metamagnetic B2-ordered FeRh Epilayers
Published on: October 5, 2013
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Layer-dependent evolution of electronic structures and correlations in rhombohedral multilayer graphene
Yang Zhang1,2, Yue-Ying Zhou1,2, Shihao Zhang1
1Key Laboratory for Micro/Nano Optoelectronic Devices of Ministry of Education and Hunan Provincial Key Laboratory of Low-Dimensional Structural Physics and Devices, School of Physics and Electronics, Hunan University, Changsha, China.
Nature Nanotechnology
|November 13, 2024
Summary
Strongly correlated electronic states emerge in multilayer rhombohedral graphene (RG) at liquid nitrogen temperatures. Thicker RG multilayers show enhanced correlations, offering new platforms for studying these phenomena.
Area of Science:
- Condensed Matter Physics
- Materials Science
Background:
- Superconductivity and magnetism discovered in trilayer rhombohedral graphene (RG).
- Limited understanding of correlated effects and layer-number evolution in multilayer RG.
Purpose of the Study:
- Investigate layer-dependent electronic structures and correlations in RG multilayers (3-9 layers).
- Explore the evolution of correlated effects with increasing layer number.
Main Methods:
- Scanning tunnelling microscopy and spectroscopy.
- Analysis of low-energy flat bands and interlayer coupling strengths.
Main Results:
- Observed layer-dependent electronic structures and correlations at 77 K.
- Determined layer-enhanced low-energy flat bands and varying interlayer coupling.
- Found significant flat band splittings (~50-80 meV) indicating interaction-induced correlated states.
- Correlated state strength enhanced in thicker RG, peaking at six layers.
Conclusions:
- RG multilayers exhibit tunable correlated electronic states up to liquid nitrogen temperature.
- Results validate theoretical predictions and establish RG as a promising system for correlated electron studies.
- Demonstrated the layer dependence of electronic properties in RG.
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