Insulating Nature of Strongly Correlated Massless Dirac Fermions in an Organic Crystal.
Through resistivity measurements of an organic crystal hosting massless Dirac fermions with a charge-ordering instability, we reveal the effect of interactions among massless Dirac fermions on the charge transport. A low-temperature resistivity upturn appears robustly irrespective of the pressure and is enhanced while approaching the critical pressure of charge ordering, indicating that the insulating behavior originates from short-range Coulomb interactions. The observation of an apparently vanishing gap in the charge-ordered phase accords with the theoretical prediction of nontopological edge states.
Department of Applied Physics, University of Tokyo, Bunkyo-ku, Tokyo 113-8656, Japan.
Dong
D
Liu
Department of Applied Physics, University of Tokyo, Bunkyo-ku, Tokyo 113-8656, Japan.
Kyohei
K
Ishikawa
Department of Applied Physics, University of Tokyo, Bunkyo-ku, Tokyo 113-8656, Japan.
Ryosuke
R
Takehara
Department of Applied Physics, University of Tokyo, Bunkyo-ku, Tokyo 113-8656, Japan.
Kazuya
K
Miyagawa
Department of Physics, Faculty of Science and Technology, Tokyo University of Science, Noda, Chiba 278-8510, Japan.
Masafumi
M
Tamura
Department of Applied Physics, University of Tokyo, Bunkyo-ku, Tokyo 113-8656, Japan.
Kazushi
K
Kanoda