Journal
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
Volume 109, Issue 48, Pages 19610-19613Publisher
NATL ACAD SCIENCES
DOI: 10.1073/pnas.1208889109
Keywords
ARPES; STM; band structure
Categories
Funding
- 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
Ask authors/readers for more resources
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.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available