@article{oai:nagoya.repo.nii.ac.jp:02001515,
 author = {Kitou, Shunsuke and Tsumuraya, Takao and Sawahata, Hikaru and Ishii, Fumiyuki and Hiraki, Ko-ichi and Nakamura, Toshikazu and Katayama, Naoyuki and Sawa, Hiroshi},
 journal = {Physical Review B},
 month = {Jan},
 note = {We investigated the precise crystal structures and electronic states of a quasi-two-dimensional molecular conductor α−(BETS)2I3 at ambient pressure. The electronic resistivity of this molecular solid shows metal-to-insulator (MI) crossover behavior at TMI=50K. Our x-ray diffraction and 13C nuclear magnetic resonance experiments revealed that α−(BETS)2I3 maintains the inversion symmetry below TMI. First-principles calculations found a pair of anisotropic Dirac cones at a general k point, with the degenerate contact points at the Fermi level. The origin of the insulating state in this system is a small energy gap of ∼2meV opened by the spin-orbit interaction. The Z2 topological invariants indicate that this system is a weak topological insulator. Our results suggest that α−(BETS)2I3 is a promising material for studying the bulk Dirac electron system in two dimensions.},
 title = {Ambient-pressure Dirac electron system in the quasi-two-dimensional molecular conductor α−(BETS)2I3},
 volume = {103},
 year = {2021}
}