Observation of a Dirac nodal line in AlB2

We have performed angle-resolved photoemission spectroscopy of AlB2 which is isostructural to high-temperature superconductor MgB2. Using soft-x-ray photons, we accurately determined the three-dimensional bulk band structure and found a highly anisotropic Dirac-cone band at the K point in the bulk h...

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Published inarXiv.org
Main Authors Takane, Daichi, Souma, Seigo, Nakayama, Kosuke, Nakamura, Takechika, Oinuma, Hikaru, Hori, Kentaro, Horiba, Kouji, Kumigashira, Hiroshi, Kimura, Noriaki, Takahashi, Takashi, Sato, Takafumi
Format Paper Journal Article
LanguageEnglish
Published Ithaca Cornell University Library, arXiv.org 18.07.2018
Subjects
Aluminum
Band structure
Band structure of solids
Brillouin zones
High temperature superconductors
Magnesium compounds
Photoelectric emission
Photons
Physics - Materials Science
Physics - Strongly Correlated Electrons
Physics - Superconductivity
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Summary:We have performed angle-resolved photoemission spectroscopy of AlB2 which is isostructural to high-temperature superconductor MgB2. Using soft-x-ray photons, we accurately determined the three-dimensional bulk band structure and found a highly anisotropic Dirac-cone band at the K point in the bulk hexagonal Brillouin zone. This band disperses downward on approaching the H point while keeping its degeneracy at the Dirac point, producing a characteristic Dirac nodal line along the KH line. We also found that the band structure of AlB2 is regarded as a heavily electron-doped version of MgB2 and is therefore well suited for fully visualizing the predicted Dirac nodal line. The present results suggest that (Al,Mg)B2 system is a promising platform for studying the interplay among Dirac nodal line, carrier doping, and possible topological superconducting properties.
ISSN:2331-8422
DOI:10.48550/arxiv.1807.01426