Coexisting charge density wave and ferromagnetic instabilities in monolayer InSe - Archive ouverte HAL
Article Dans Une Revue npj Computational Materials Année : 2022

Coexisting charge density wave and ferromagnetic instabilities in monolayer InSe

Evgeny Stepanov
Malte Rösner
Mikhail Katsnelson
Alexander Rudenko

Résumé

Abstract Recently fabricated InSe monolayers exhibit remarkable characteristics that indicate the potential of this material to host a number of many-body phenomena. In this work, we systematically describe collective electronic effects in hole-doped InSe monolayers using advanced many-body techniques. To this end, we derive a realistic electronic-structure model from first principles that takes into account the most important characteristics of this material, including a flat band with prominent van Hove singularities in the electronic spectrum, strong electron–phonon coupling, and weakly screened long-ranged Coulomb interactions. We calculate the temperature-dependent phase diagram as a function of band filling and observe that this system is in a regime with coexisting charge density wave and ferromagnetic instabilities that are driven by strong electronic Coulomb correlations. This regime can be achieved at realistic doping levels and high enough temperatures, and can be verified experimentally. We find that the electron–phonon interaction does not play a crucial role in these effects, effectively suppressing the local Coulomb interaction without changing the qualitative physical picture.

Dates et versions

hal-04481274 , version 1 (27-02-2024)

Identifiants

Citer

Evgeny Stepanov, Viktor Harkov, Malte Rösner, Alexander Lichtenstein, Mikhail Katsnelson, et al.. Coexisting charge density wave and ferromagnetic instabilities in monolayer InSe. npj Computational Materials, 2022, 8 (1), pp.118. ⟨10.1038/s41524-022-00798-4⟩. ⟨hal-04481274⟩
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