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

S. Kanayama; K. Nakayama; G. N. Phan; M. Kuno; K. Sugawara; T. Takahashi; T. Sato

doi:10.1103/PhysRevB.96.220509

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

S. Kanayama, K. Nakayama, G. N. Phan, M. Kuno, K. Sugawara, T. Takahashi, T. Sato

Tohoku University

Research output: Contribution to journal › Article › peer-review

7 Citations (Scopus)

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.

Original language	English
Article number	220509
Journal	Physical Review B
Volume	96
Issue number	22
DOIs	https://doi.org/10.1103/PhysRevB.96.220509
Publication status	Published - 2017 Dec 29

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10.1103/PhysRevB.96.220509

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title = "Two-dimensional Dirac semimetal phase in undoped one-monolayer FeSe film",

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.",

author = "S. Kanayama and K. Nakayama and Phan, {G. N.} and M. Kuno and K. Sugawara and T. Takahashi and T. Sato",

note = "Funding Information: This work was supported by JSPS KAKENHI Grants No. JP17H04847, No. JP17H01139, No. JP15H02105, No. JP25287079, No. JP15H05853, and No. JP25107003, the Murata Science Foundation, and High Energy Accelerator Research (KEK-PF) (Proposal No. 2015S2-003). Publisher Copyright: {\textcopyright} 2017 American Physical Society.",

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doi = "10.1103/PhysRevB.96.220509",

language = "English",

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AU - Kanayama, S.

AU - Nakayama, K.

AU - Phan, G. N.

AU - Kuno, M.

AU - Sugawara, K.

AU - Takahashi, T.

AU - Sato, T.

N1 - Funding Information: This work was supported by JSPS KAKENHI Grants No. JP17H04847, No. JP17H01139, No. JP15H02105, No. JP25287079, No. JP15H05853, and No. JP25107003, the Murata Science Foundation, and High Energy Accelerator Research (KEK-PF) (Proposal No. 2015S2-003). Publisher Copyright: © 2017 American Physical Society.

PY - 2017/12/29

Y1 - 2017/12/29

N2 - 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.

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

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