Visualizing the out-of-plane electronic dispersions in an intercalated transition metal dichalcogenide

Abstract

Layered transition metal dichalcogenides have rich phase diagram and they feature two dimensionality on numerous physical properties. Co1/3NbS2 is one of the newest members of this family where Co atoms are intercalated into the Van der Waals gaps between NbS2 layers. We study the three-dimensional electronic band structure of Co1/3NbS2 using both surface and bulk sensitive angle-resolved photoemission spectroscopy. We show that the electronic bands do not fit into the rigid-band-shift picture after the Co intercalation. Instead, Co1/3NbS2 displays a different orbital character near the Fermi level compared to the pristine NbS2 compound and has a clear band dispersion in kz direction despite its layered structure. Our photoemission study demonstrates the out-of-plane electronic correlations introduced by the Co intercalation, thus offering a new perspective on this compound. Finally, we propose how Fermi level tuning could lead to exotic phases such as spin density wave instability.

arXiv commentAccepted by Physical Review B

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• Altermagnetism in the layered intercalated transition metal dichalcogenide CoNb${}_4$Se${}_8$
• Comparative Electronic Structures of the Chiral Helimagnets Cr1/3NbS2 and Cr1/3TaS2
• Chiral Dirac fermion in a collinear antiferromagnet
• Electronic transport and magnetism in the alternating stack of metallic and highly frustrated magnetic layers in Co${}_{1/3}$NbS${}_2$
• Gapped nodal planes drive a large topological Nernst effect in a chiral lattice antiferromagnet
• Sub-tesla on-chip nanomagnetic metamaterial platform for angle-resolved photoemission spectroscopy
• Correlation-driven origin of shallow electron pocket in Co${}_{1/3}$TaS${}_2$ revealed by ARPES and cluster perturbation theory