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Insulating Nature of Strongly Correlated Massless Dirac Fermions in an Organic Crystal.
Liu, Dong; Ishikawa, Kyohei; Takehara, Ryosuke; Miyagawa, Kazuya; Tamura, Masafumi; Kanoda, Kazushi.
Affiliation
  • Liu D; Department of Applied Physics, University of Tokyo, Bunkyo-ku, Tokyo 113-8656, Japan.
  • Ishikawa K; Department of Applied Physics, University of Tokyo, Bunkyo-ku, Tokyo 113-8656, Japan.
  • Takehara R; Department of Applied Physics, University of Tokyo, Bunkyo-ku, Tokyo 113-8656, Japan.
  • Miyagawa K; Department of Applied Physics, University of Tokyo, Bunkyo-ku, Tokyo 113-8656, Japan.
  • Tamura M; Department of Physics, Faculty of Science and Technology, Tokyo University of Science, Noda, Chiba 278-8510, Japan.
  • Kanoda K; Department of Applied Physics, University of Tokyo, Bunkyo-ku, Tokyo 113-8656, Japan.
Phys Rev Lett ; 116(22): 226401, 2016 Jun 03.
Article in En | MEDLINE | ID: mdl-27314731
ABSTRACT
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.
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Full text: 1 Collection: 01-internacional Database: MEDLINE Language: En Journal: Phys Rev Lett Year: 2016 Type: Article Affiliation country: Japan
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Full text: 1 Collection: 01-internacional Database: MEDLINE Language: En Journal: Phys Rev Lett Year: 2016 Type: Article Affiliation country: Japan