期刊
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
卷 109, 期 48, 页码 19610-19613出版社
NATL ACAD SCIENCES
DOI: 10.1073/pnas.1208889109
关键词
ARPES; STM; band structure
资金
- Japan Society for the Promotion of Science
- Japan Science and Technology Agency-Core Research for Evolutional Science and Technology
- Ministry of Education, Culture, Sports, Science, and Technology of Japan
- World Premier International Research Center, Advanced Institute for Materials Research
- Grants-in-Aid for Scientific Research [23224010, 21340088, 24740216, 23686002] Funding Source: KAKEN
Success in isolating a 2D graphene sheet from bulky graphite has triggered intensive studies of its physical properties as well as its application in devices. Graphite intercalation compounds (GICs) have provided a platform of exotic quantum phenomena such as superconductivity, but it is unclear whether such intercalation is feasible in the thinnest 2D limit (i.e., bilayer graphene). Here we report a unique experimental realization of 2D GIC, by fabricating calcium-intercalated bilayer graphene C6CaC6 on silicon carbide. We have investigated the structure and electronic states by scanning tunneling microscopy and angle-resolved photoemission spectroscopy. We observed a free-electron-like interlayer band at the Brillouin-zone center, which is thought to be responsible for the superconductivity in 3D GICs, in addition to a large pi* Fermi surface at the zone boundary. The present success in fabricating Ca-intercalated bilayer graphene would open a promising route to search for other 2D superconductors as well as to explore its application in devices.
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