Summary
This paper examines the interplay between charge-density waves and superconductivity in monolayer transition-metal dichalcogenides by comparing the electronic structure of NbS₂ and NbSe₂. Although both materials have similar Fermi surface features, monolayer NbS₂ exhibits a more triangular K-point pocket and crucially shows no evidence of charge-density wave or superconducting states, unlike its isostructural NbSe₂ counterpart. The findings suggest that subtle changes in fermiology—specifically suppression of quasiparticle scattering between hot spots—can dramatically alter the stability of collective electronic phenomena in low-dimensional materials.
UK applicability
This fundamental materials physics research has no direct applicability to UK agricultural, soil health, or nutrition policy and practice. The work is relevant only to condensed-matter physics research communities.
Key measures
Fermi surface geometry (hole pocket shapes at Γ and K points), charge-density wave signatures via scanning tunneling microscopy, low-temperature transport measurements, quasiparticle scattering characteristics
Outcomes reported
The study investigated the electronic structure of monolayer NbS₂ and NbSe₂ films using angle-resolved photoemission spectroscopy and first-principles calculations, comparing their Fermi surface topology and the presence or absence of charge-density wave and superconducting states.
Topic tags
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