Two-Dimensional Dirac Fermions Protected by Space-Time Inversion Symmetry in Black Phosphorus

Jimin Kim, Seung Su Baik, Sung Won Jung, Yeongsup Sohn, Sae Hee Ryu, Hyoung Joon Choi, Bohm Jung Yang, Keun Su Kim

Research output: Contribution to journalArticle

27 Citations (Scopus)

Abstract

We report the realization of novel symmetry-protected Dirac fermions in a surface-doped two-dimensional (2D) semiconductor, black phosphorus. The widely tunable band gap of black phosphorus by the surface Stark effect is employed to achieve a surprisingly large band inversion up to ∼0.6 eV. High-resolution angle-resolved photoemission spectra directly reveal the pair creation of Dirac points and their movement along the axis of the glide-mirror symmetry. Unlike graphene, the Dirac point of black phosphorus is stable, as protected by space-time inversion symmetry, even in the presence of spin-orbit coupling. Our results establish black phosphorus in the inverted regime as a simple model system of 2D symmetry-protected (topological) Dirac semimetals, offering an unprecedented opportunity for the discovery of 2D Weyl semimetals.

Original languageEnglish
Article number226801
JournalPhysical Review Letters
Volume119
Issue number22
DOIs
Publication statusPublished - 2017 Nov 29

Fingerprint

phosphorus
fermions
inversions
metalloids
symmetry
Stark effect
graphene
photoelectric emission
mirrors
orbits
high resolution

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)

Cite this

Kim, Jimin ; Baik, Seung Su ; Jung, Sung Won ; Sohn, Yeongsup ; Ryu, Sae Hee ; Choi, Hyoung Joon ; Yang, Bohm Jung ; Kim, Keun Su. / Two-Dimensional Dirac Fermions Protected by Space-Time Inversion Symmetry in Black Phosphorus. In: Physical Review Letters. 2017 ; Vol. 119, No. 22.
@article{cadee233816c4a06afaf505791e0ae6b,
title = "Two-Dimensional Dirac Fermions Protected by Space-Time Inversion Symmetry in Black Phosphorus",
abstract = "We report the realization of novel symmetry-protected Dirac fermions in a surface-doped two-dimensional (2D) semiconductor, black phosphorus. The widely tunable band gap of black phosphorus by the surface Stark effect is employed to achieve a surprisingly large band inversion up to ∼0.6 eV. High-resolution angle-resolved photoemission spectra directly reveal the pair creation of Dirac points and their movement along the axis of the glide-mirror symmetry. Unlike graphene, the Dirac point of black phosphorus is stable, as protected by space-time inversion symmetry, even in the presence of spin-orbit coupling. Our results establish black phosphorus in the inverted regime as a simple model system of 2D symmetry-protected (topological) Dirac semimetals, offering an unprecedented opportunity for the discovery of 2D Weyl semimetals.",
author = "Jimin Kim and Baik, {Seung Su} and Jung, {Sung Won} and Yeongsup Sohn and Ryu, {Sae Hee} and Choi, {Hyoung Joon} and Yang, {Bohm Jung} and Kim, {Keun Su}",
year = "2017",
month = "11",
day = "29",
doi = "10.1103/PhysRevLett.119.226801",
language = "English",
volume = "119",
journal = "Physical Review Letters",
issn = "0031-9007",
publisher = "American Physical Society",
number = "22",

}

Two-Dimensional Dirac Fermions Protected by Space-Time Inversion Symmetry in Black Phosphorus. / Kim, Jimin; Baik, Seung Su; Jung, Sung Won; Sohn, Yeongsup; Ryu, Sae Hee; Choi, Hyoung Joon; Yang, Bohm Jung; Kim, Keun Su.

In: Physical Review Letters, Vol. 119, No. 22, 226801, 29.11.2017.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Two-Dimensional Dirac Fermions Protected by Space-Time Inversion Symmetry in Black Phosphorus

AU - Kim, Jimin

AU - Baik, Seung Su

AU - Jung, Sung Won

AU - Sohn, Yeongsup

AU - Ryu, Sae Hee

AU - Choi, Hyoung Joon

AU - Yang, Bohm Jung

AU - Kim, Keun Su

PY - 2017/11/29

Y1 - 2017/11/29

N2 - We report the realization of novel symmetry-protected Dirac fermions in a surface-doped two-dimensional (2D) semiconductor, black phosphorus. The widely tunable band gap of black phosphorus by the surface Stark effect is employed to achieve a surprisingly large band inversion up to ∼0.6 eV. High-resolution angle-resolved photoemission spectra directly reveal the pair creation of Dirac points and their movement along the axis of the glide-mirror symmetry. Unlike graphene, the Dirac point of black phosphorus is stable, as protected by space-time inversion symmetry, even in the presence of spin-orbit coupling. Our results establish black phosphorus in the inverted regime as a simple model system of 2D symmetry-protected (topological) Dirac semimetals, offering an unprecedented opportunity for the discovery of 2D Weyl semimetals.

AB - We report the realization of novel symmetry-protected Dirac fermions in a surface-doped two-dimensional (2D) semiconductor, black phosphorus. The widely tunable band gap of black phosphorus by the surface Stark effect is employed to achieve a surprisingly large band inversion up to ∼0.6 eV. High-resolution angle-resolved photoemission spectra directly reveal the pair creation of Dirac points and their movement along the axis of the glide-mirror symmetry. Unlike graphene, the Dirac point of black phosphorus is stable, as protected by space-time inversion symmetry, even in the presence of spin-orbit coupling. Our results establish black phosphorus in the inverted regime as a simple model system of 2D symmetry-protected (topological) Dirac semimetals, offering an unprecedented opportunity for the discovery of 2D Weyl semimetals.

UR - http://www.scopus.com/inward/record.url?scp=85037709084&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=85037709084&partnerID=8YFLogxK

U2 - 10.1103/PhysRevLett.119.226801

DO - 10.1103/PhysRevLett.119.226801

M3 - Article

AN - SCOPUS:85037709084

VL - 119

JO - Physical Review Letters

JF - Physical Review Letters

SN - 0031-9007

IS - 22

M1 - 226801

ER -