1. Charge-Density Wave in Ca-Intercalated Bilayer Graphene Induced by Commensurate Lattice Matching
- Author
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Shimizu, Ryota, Sugawara, Katsuaki, Kanetani, Kohei, Iwaya, Katsuya, Sato, Takafumi, Takahashi, Takashi, and Hitosugi, Taro
- Subjects
Superconductivity ,Materials science ,Condensed matter physics ,Photoemission spectroscopy ,General Physics and Astronomy ,Epitaxy ,law.invention ,Condensed Matter::Materials Science ,law ,Condensed Matter::Superconductivity ,Lattice (order) ,Condensed Matter::Strongly Correlated Electrons ,Scanning tunneling microscope ,Bilayer graphene ,Spectroscopy ,Charge density wave - Abstract
We report the emergence of a charge-density wave (CDW) in Ca-intercalated bilayer graphene (${\mathrm{C}}_{6}\mathrm{Ca}{\mathrm{C}}_{6}$), the thinnest limit of superconducting ${\mathrm{C}}_{6}\mathrm{Ca}$, observed by low-temperature, high-magnetic-field scanning tunneling microscopy or spectroscopy, and angle-resolved photoemission spectroscopy. While the possible superconductivity was not observed in epitaxially grown ${\mathrm{C}}_{6}\mathrm{Ca}{\mathrm{C}}_{6}$ on a SiC substrate, a CDW order different from that observed on the surface of bulk ${\mathrm{C}}_{6}\mathrm{Ca}$ was observed. It is inferred that the CDW state is induced by the potential modulation due to the commensurate lattice matching between the ${\mathrm{C}}_{6}\mathrm{Ca}{\mathrm{C}}_{6}$ film and the SiC substrate.
- Published
- 2014