Moving Dirac nodes by chemical substitution - CEA - Université Paris-Saclay
Journal Articles Proceedings of the National Academy of Sciences of the United States of America Year : 2021

Moving Dirac nodes by chemical substitution

Pascal Simon
Ivana Vobornik
Jun Fujii
Marino Marsi

Abstract

Dirac fermions play a central role in the study of topological phases, for they can generate a variety of exotic states, such as Weyl semimetals and topological insulators. The control and manipulation of Dirac fermions constitute a fundamental step toward the realization of novel concepts of electronic devices and quantum computation. By means of Angle-Resolved Photo-Emission Spectroscopy (ARPES) experiments and ab initio simulations, here, we show that Dirac states can be effectively tuned by doping a transition metal sulfide, B a N i S 2 , through Co/Ni substitution. The symmetry and chemical characteristics of this material, combined with the modification of the charge-transfer gap of B a C o 1 − x N i x S 2 across its phase diagram, lead to the formation of Dirac lines, whose position in k-space can be displaced along the Γ − M symmetry direction and their form reshaped. Not only does the doping x tailor the location and shape of the Dirac bands, but it also controls the metal-insulator transition in the same compound, making B a C o 1 − x N i x S 2 a model system to functionalize Dirac materials by varying the strength of electron correlations.
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Dates and versions

hal-04444056 , version 1 (11-11-2024)

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Niloufar Nilforoushan, Michele Casula, Adriano Amaricci, Marco Caputo, Jonathan Caillaux, et al.. Moving Dirac nodes by chemical substitution. Proceedings of the National Academy of Sciences of the United States of America, 2021, 118 (33), pp.e2108617118. ⟨10.1073/pnas.2108617118⟩. ⟨hal-04444056⟩
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