title: New metallic carbon crystal.
abstract: Recently, mathematical analysis clarified that sp;{2} hybridized carbon should have a three-dimensional crystal structure (K4) which can be regarded as a twin of the sp;{3} diamond crystal. In this study, various physical properties of the K4 carbon crystal, especially for the electronic properties, were evaluated by first principles calculations. Although the K4 crystal is in a metastable state, a possible pressure induced structural phase transition from graphite to K4 was suggested. Twisted pi states across the Fermi level result in metallic properties in a new carbon crystal.
authors.affiliation: Institute of Multidisciplinary Research for Advanced Materials, Tohoku University, Aoba-ku, Sendai 980-8577, Japan.
authors.forename: Masahiro
authors.initials: M
authors.lastname: Itoh
authors.forename: Motoko
authors.initials: M
authors.lastname: Kotani
authors.forename: Hisashi
authors.initials: H
authors.lastname: Naito
authors.forename: Toshikazu
authors.initials: T
authors.lastname: Sunada
authors.forename: Yoshiyuki
authors.initials: Y
authors.lastname: Kawazoe
authors.forename: Tadafumi
authors.initials: T
authors.lastname: Adschiri