期刊
SCIENCE
卷 328, 期 5981, 页码 999-1002出版社
AMER ASSOC ADVANCEMENT SCIENCE
DOI: 10.1126/science.1186489
关键词
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资金
- Office of Science
- Office of Basic Energy Sciences
- U.S. Department of Energy [DE-AC02-05CH11231]
- Deutsche Forschungsgemeinschaft [SE1087/5-1]
- University of Erlangen-Nuremberg
- Welch Foundation
- Defense Applications Research Projects Agency
- Program on Carbon Electronics for RF Applications
A hallmark of graphene is its unusual conical band structure that leads to a zero-energy band gap at a single Dirac crossing point. By measuring the spectral function of charge carriers in quasi-freestanding graphene with angle-resolved photoemission spectroscopy, we showed that at finite doping, this well-known linear Dirac spectrum does not provide a full description of the charge-carrying excitations. We observed composite plasmaron particles, which are bound states of charge carriers with plasmons, the density oscillations of the graphene electron gas. The Dirac crossing point is resolved into three crossings: the first between pure charge bands, the second between pure plasmaron bands, and the third a ring-shaped crossing between charge and plasmaron bands.
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