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

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Title
Two-Dimensional Dirac Fermions Protected by Space-Time InversionSymmetry in Black Phosphorus
Author(s)
Jimin Kim; Seung Su Baik; Sung Won Jung; Yeongsup Sohn; Sae Hee Ryu; Hyoung Joon Choi; Bohm-Jung Yang; Keun Su Kim
Publication Date
2017-12
Journal
PHYSICAL REVIEW LETTERS, v.119, no.22, pp.226801 -
Publisher
AMER PHYSICAL SOC
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. © 2017 American Physical Society
URI
https://pr.ibs.re.kr/handle/8788114/4128
ISSN
0031-9007
Appears in Collections:
Center for Artificial Low Dimensional Electronic Systems(원자제어 저차원 전자계 연구단) > Journal Papers (저널논문)
Center for Correlated Electron Systems(강상관계 물질 연구단) > Journal Papers (저널논문)
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