What is it about?

Dirac fermions play a central role in the physics of topological materials. We have shown for the first time that the properties of Dirac cones can be varied in reciprocal space by chemical substitution. By acting on the Co/Ni substitution in the correlated system BaCo_{1-x}Ni_{x}S_{2}, we have succeeded in manipulating the position and shape of its Dirac lines. Remarkably, the same Co/Ni substitution can be also used to control the metal-insulator transition across the phase diagram of this material.

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Why is it important?

The on-demand control of topological properties with macroscopic parameters is the key to realize a novel generation of electronic devices. We have shown that the tunability of Dirac states can been realized by varying the electron correlation strength and the charge-transfer gap in a class of late-transition metal compounds. Our findings indicate a new pathway for engineering highly tunable Dirac materials.

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This page is a summary of: Moving Dirac nodes by chemical substitution, Proceedings of the National Academy of Sciences, August 2021, Proceedings of the National Academy of Sciences,
DOI: 10.1073/pnas.2108617118.
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