Charge order with unusual star-of-David lattice in monolayer NbTe2
| Autor: | Taguchi, Taiki, Sugawara, Katsuaki, Oka, Hirofumi, Kawakami, Tappei, Saruta, Yasuaki, Kato, Takemi, Nakayama, Kosuke, Souma, Seigo, Takahashi, Takashi, Fukumura, Tomoteru, Sato, Takafumi |
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| Rok vydání: | 2022 |
| Předmět: | |
| Druh dokumentu: | Working Paper |
| DOI: | 10.1103/PhysRevB.107.L041105 |
| Popis: | Interplay between fermiology and electron correlation is crucial for realizing exotic quantum phases. Transition-metal dichalcogenide (TMD) 1T-TaS2 has sparked a tremendous attention owing to its unique Mott-insulating phase coexisting with the charge-density wave (CDW). However, how the fermiology and electron correlation are associated with such properties has yet to be claried. Here we demonstrate that monolayer 1T-NbTe2 is a new class of two-dimensional TMD which has the star-of-David lattice similarly to bulk TaS2 and isostructural monolayer NbSe2, but exhibits a metallic ground state with an unusual lattice periodicity root19xroot19 characterized by the sparsely occupied star-of-David lattice. By using angle-resolved photoemission and scanning-tunneling spectroscopies in combination with first-principles band-structure calculations, we found that the hidden Fermi-surface nesting and associated CDW formation are a primary cause to realize this unique correlated metallic state with no signature of Mott gap. The present result points to a vital role of underlying fermiology to characterize the Mott phase of TMDs. Comment: To be published in Physical Review B |
| Databáze: | arXiv |
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