Fermiology and electron-phonon coupling in the 
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 and 
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 polytypes of 
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Youbi, Zakariae El; Jung, Sung Won; Richter, Christine; Hricovíni, K.; Cacho, Céphise; Watson, M. D.

doi:10.1103/physrevb.103.155105

Cited by 19 publications

(16 citation statements)

References 48 publications

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“…2b,c, these pockets have hole-like nature and extend to the A and H points at k z = π/c, where according to DFT calculations, the pockets are doubly degenerate. Our results are consistent with two previous reports of NbS 2 [32,33], except that contrary to Ref. [32], we observe a holelike band at Γ, just below the Fermi energy (E F ).…”

Section: Resultssupporting

confidence: 93%

Probing the interlayer coupling in 2$H$-NbS$_2$ via soft x-ray angle-resolved photoemission spectroscopy

Huang,

Nakamura,

Küster

et al. 2022

Preprint

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In the large family of two-dimensional (2D) layered materials including graphene, its honeycomb analogs, and transition-metal dichalcogenides, the interlayer coupling plays a rather intriguing role. On the one hand, the weak van der Waals interaction that holds the layers together endows these compounds with quasi-2D properties, which might imply small interlayer effects on the electronically active bands. On the other hand, the oft-witnessed differences in electronic, optical, and magnetic behaviors of monolayers, bilayers, and multilayers of the same compound must have as their microscopic origin the detailed interlayer hopping parameters. Given the few experimental reports that have attempted to explicitly extract these parameters, we employ soft-x-ray angle-resolved photoemission spectroscopy (SX-ARPES) to probe the interlayer coupling in superconducting 2H-NbS2. We visualize the S 3pz bands that disperse with respect to the out-of-plane momentum and introduce a simple tight-binding model to extract the interlayer hopping parameters. From firstprinciples calculations, we clarify how atomic distances and the proper accounting for screening via hybrid functionals influence these bands. The knowledge of interlayer hopping parameters is particularly pertinent in NbS2, where recent experiments have uncovered fingerprints of finite-momentum superconductivity in the bulk material and heterostructures.

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Section: Resultssupporting

confidence: 93%

Probing the interlayer coupling in 2$H$-NbS$_2$ via soft x-ray angle-resolved photoemission spectroscopy

Huang,

Nakamura,

Küster

et al. 2022

Preprint

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“…Since intuitively Co1/3NbS2 can be treated as the pristine NbS2 doped by the intercalated Co atoms, we compare our experimentally measured Co1/3NbS2 band structure with that of 2H-NbS2 [28]. Although early studies proposed that intercalation into layers of TMDs would just shift the Fermi level of the bulk band structure (the so called rigidband-shift picture) [8][20] [21], a recent photoemission study on a sister compound suggested that this theory is not valid [29].…”

mentioning

confidence: 99%

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

et al. 2022

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“…For the Fermi level, the rigid band picture foretells two hole-like pockets appearing around Γ point, as well as around K 0 point. The only expected difference from the Fermi surfaces measured in pristine 2H-NbS 2 [35] would be the reduction in the size of those pockets caused by the electron transfer from Co into NbS 2 layers. In fact, this kind of reduction in size was already reported for sister materials Mn 1/3 NbS 2 and Ni 1/3 NbS 2 in Ref.…”

Section: The Signal At the Fermi Levelmentioning

confidence: 86%

Role of intercalated Cobalt in the electronic structure of Co$_{1/3}$NbS$_2$

Popčević,

Utsumi,

Biało

et al. 2021

Preprint

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Co 1/3 NbS2 is the magnetic intercalate of 2H-NbS2 where electronic itinerant and magnetic properties strongly influence each other throughout the phase diagram. Here we report the first angleresolved photoelectron spectroscopy (ARPES) study in Co 1/3 NbS2. In agreement with previous reports, the observed electronic structure seemingly resembles the one of the parent material 2H-NbS2, with the shift in Fermi energy of 0.5 eV accounting for the charge transfer of approximately two electrons from each Co ion into the NbS2 layers. However, in addition and in contrast to previous reports, we observe significant departures that cannot be explained by rigid band shift or minor deformation of bands: First, entirely unrelated to the 2H-NbS2 electronic structure, a shallow electronic band is found crossing the Fermi level near the boundary of the first Brillouin zone of the superstructure imposed by the intercalation. The evolution of the experimental spectra upon varying the incident photon energy suggests the Co origin of this band. Second, the Nb bonding band, found deeply submerged below the Fermi level at the Γ point, indicates that the interlayerhybridization is significantly amplified by intercalation, with Co magnetic ions probably acting as covalent bridges between NbS2 layers. The strong hybridization between itinerant and magnetic degrees of freedom points towards the importance of strong electronic correlations, with the interlayer coupling playing an exquisite role.

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Fermiology and electron-phonon coupling in the 2H and 3R polytypes of NbS2

Cited by 19 publications

References 48 publications

Probing the interlayer coupling in 2$H$-NbS$_2$ via soft x-ray angle-resolved photoemission spectroscopy

Probing the interlayer coupling in 2$H$-NbS$_2$ via soft x-ray angle-resolved photoemission spectroscopy

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

Role of intercalated Cobalt in the electronic structure of Co$_{1/3}$NbS$_2$

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