Unveiling hidden charge density waves in single-layer NbSe${}_2$ by impurities

Abstract

We employ {\it{ab-initio}} calculations to investigate the charge density waves in single-layer NbSe${}_2$, and we explore how they are affected by transition metal atoms. Our calculations reproduce the observed orthorhombic phase in single-layer NbSe${}_2$ in the clean limit, establishing the energy order between three different distorted structures, two consisting of triangular Nb-Nb clusters and a third, energetically unfavoured, consisting of hexagonal Nb-Nb clusters. Such energy order, in agreement with known experimental work, is reversed by the adsorption of Co and Mn, which favour the formation of hexagonal Nb-Nb clusters; this CDW structure is indeed allowed from symmetry point of view but hidden in pure single layers because it is at a higher energy. The other adsorbates, K and Ga, still favour one of the triangular Nb-Nb cluster, while suppressing the other. We report how the energy difference between such distorted structure varies with these adsorbates. Furthermore, transition metals induce magnetism and favour the reduction of the symmetry of the charge density distribution.

arXiv comment16 pages, 17 figures

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Cited by in corpus (8)

• Yu-Shiba-Rusinov states in the charge-density modulated superconductor NbSe2
• Topological Landscape of Competing Charge Density Waves in 2H-NbSe2
• Strain-induced stripe phase in charge ordered single layer NbSe${}_2$
• Impurity-pinned incommensurate charge density wave and local phonon excitations in 2H-NbS2
• Magnetism between magnetic adatoms on monolayer NbSe${}_2$
• Unconventional pairing in Ising superconductors: Application to monolayer NbSe${}_2$
• Stacking of charge-density waves in 2H-NbSe${}_2$ bilayers
• Charge-density-wave control by adatom manipulation and its effect on magnetic nanostructures