title: Charge-density wave in Ca-intercalated bilayer graphene induced by commensurate lattice matching.
abstract: We report the emergence of a charge-density wave (CDW) in Ca-intercalated bilayer graphene (C_{6}CaC_{6}), the thinnest limit of superconducting C_{6}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 C_{6}CaC_{6} on a SiC substrate, a CDW order different from that observed on the surface of bulk C_{6}Ca was observed. It is inferred that the CDW state is induced by the potential modulation due to the commensurate lattice matching between the C_{6}CaC_{6} film and the SiC substrate.
authors.affiliation: Advanced Institute for Materials Research (AIMR), Tohoku University, Sendai 980-8577, Japan.
authors.forename: Ryota
authors.initials: R
authors.lastname: Shimizu
authors.affiliation: Advanced Institute for Materials Research (AIMR), Tohoku University, Sendai 980-8577, Japan.
authors.forename: Katsuaki
authors.initials: K
authors.lastname: Sugawara
authors.affiliation: Department of Physics, Tohoku University, Sendai 980-8578, Japan.
authors.forename: Kohei
authors.initials: K
authors.lastname: Kanetani
authors.affiliation: Advanced Institute for Materials Research (AIMR), Tohoku University, Sendai 980-8577, Japan.
authors.forename: Katsuya
authors.initials: K
authors.lastname: Iwaya
authors.affiliation: Department of Physics, Tohoku University, Sendai 980-8578, Japan.
authors.forename: Takafumi
authors.initials: T
authors.lastname: Sato
authors.affiliation: Advanced Institute for Materials Research (AIMR), Tohoku University, Sendai 980-8577, Japan.|Department of Physics, Tohoku University, Sendai 980-8578, Japan.
authors.forename: Takashi
authors.initials: T
authors.lastname: Takahashi
authors.affiliation: Advanced Institute for Materials Research (AIMR), Tohoku University, Sendai 980-8577, Japan.
authors.forename: Taro
authors.initials: T
authors.lastname: Hitosugi