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Article Dans Une Revue Proceedings of the National Academy of Sciences of the United States of America Année : 2021

Moving Dirac nodes by chemical substitution

Niloufar Nilforoushan
Adriano Amaricci
Marco Caputo
  • Fonction : Auteur
Jonathan Caillaux
  • Fonction : Auteur
Lama Khalil
Evangelos Papalazarou
  • Fonction : Auteur
Pascal Simon
Luca Perfetti
Ivana Vobornik
Pranab Kumar Das
  • Fonction : Auteur
Jun Fujii
Alexei Barinov
  • Fonction : Auteur
David Santos-Cottin
  • Fonction : Auteur
Yannick Klein
Michele Fabrizio
Andrea Gauzzi
Marino Marsi

Résumé

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.

Dates et versions

hal-03450366 , version 1 (26-11-2021)

Identifiants

Citer

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-03450366⟩
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