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Two-dimensional Dirac semimetal phase in undoped one-monolayer FeSe film

S. Kanayama, K. Nakayama, G. N. Phan, M. Kuno, K. Sugawara, T. Takahashi, and T. Sato
Phys. Rev. B 96, 220509(R) – Published 29 December 2017
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Abstract

We have performed an in situ angle-resolved photoemission spectroscopy study of undoped one-monolayer (1-ML) FeSe film on SrTiO3 to elucidate the nature of the parent phase of high-temperature superconductivity. Accurate tuning of carrier concentration at zero doping by low-temperature postgrowth annealing of the film enabled us to observe a linearly dispersive Dirac-cone band and a pointlike Fermi surface on the ΓM mirror reflection plane arising from the nematic order. Intriguingly, the low-energy excitations of this material are solely characterized by the Dirac-cone band, since no other bands cross the Fermi level unlike its multilayer counterpart. The present result strongly suggests that undoped 1-ML FeSe is a two-dimensional Dirac semimetal with a mirror-symmetry-protected Dirac-cone band.

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  • Received 9 August 2017

DOI:https://doi.org/10.1103/PhysRevB.96.220509

©2017 American Physical Society

Physics Subject Headings (PhySH)

Condensed Matter, Materials & Applied Physics

Authors & Affiliations

S. Kanayama1, K. Nakayama1, G. N. Phan1, M. Kuno1, K. Sugawara2,3, T. Takahashi1,2,3, and T. Sato1,3

  • 1Department of Physics, Tohoku University, Sendai 980-8578, Japan
  • 2WPI Research Center, Advanced Institute for Materials Research, Tohoku University, Sendai 980-8577, Japan
  • 3Center for Spintronics Research Network (CSRN), Tohoku University, Sendai 980-8577, Japan

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Issue

Vol. 96, Iss. 22 — 1 December 2017

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