Symmetry-Protected Dirac Semimetal Phase in Surface-Doped Black Phosphorus
ORAL
Abstract
Two-dimensional (2D) black phosphorus has attracted growing interest owing to its tunable band structure with external parameters such as field and strain. In particular, the effect of strong vertical electric field can be induced by in-situ surface doping of alkali metal atoms on the surface of black phosphorus, leading to the widely tunable band gap. In this study, we experimentally demonstrate the giant band inversion in the surface of black phosphorus by means of angle-resolved photoemission spectroscopy (ARPES). Our ARPES spectra reveal that the band-inverted state of black phosphorus has a pair of Dirac cones that are separated along the zigzag direction. Unlike graphene, the Dirac points of black phosphorus are stable even in the presence of spin-orbit coupling owing to space-time inversion symmetry, a combination of glide-mirror symmetry and time-reversal symmetry.
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Presenters
Jimin Kim
Physics, POSTECH & Yonsei University
Authors
Jimin Kim
Physics, POSTECH & Yonsei University
Seung Su Baik
School of Computational Sciences, Korea Inst for Advanced Study
Korea Institute for Advanced Study
SungWon Jung
Physics, POSTECH & Yonsei University
Yeongsup Sohn
Physics, POSTECH & Yonsei University
Sae Hee Ryu
Physics, POSTECH & Yonsei University
Hyoung Joon Choi
Physics, Yonsei University
Department of Physics and Center for Computational Studies of Advanced Electronic Material Properties, Yonsei University
Physics, Yonsei Univ.
Dept. of Physics, Yonsei University
Department of Physics, Yonsei University
Department of Physics, Center for Computational Studies of Advanced Electronic Material Properties, Yonsei University
Institute of Physics and Applied Physics, Yonsei University
Department of Physics, and Center for Computational Studies of Advanced Electronic Material Properties, Yonsei University
Bohm-Jung Yang
Department of Physics and Astronomy, Seoul National University
