期刊
ACS NANO
卷 14, 期 1, 页码 1055-1069出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsnano.9b08622
关键词
graphene; flat band; angle resolved photoemission spectroscopy; alkali-metal intercalation compound; Stoner criterion
类别
资金
- ERC [648589]
- Quantum Matter and Materials
- Horizon 2020 EC program [730872]
- DAAD
- JSPS KAKENHI [JP18H01810]
- [CRC1238]
- European Research Council (ERC) [648589] Funding Source: European Research Council (ERC)
A flat energy dispersion of electrons at the Fermi level of a material leads to instabilities in the electronic system and can drive phase transitions. Here we show that the flat band in graphene can be achieved by sandwiching a graphene monolayer by two cesium (Cs) layers. We investigate the flat band by a combination of angle-resolved photoemission spectroscopy experiment and the calculations. Our work highlights that charge transfer, zone folding of graphene bands, and the covalent bonding between C and Cs atoms are the origin of the flat energy band formation. Analysis of the Stoner criterion for the flat band suggests the presence of a ferromagnetic instability. The presented approach is an alternative route for obtaining flat band materials to twisting bilayer graphene which yields thermodynamically stable flat band materials in large areas.
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