Journal article
Flat band physics in the charge-density wave state of 1T-TaS2 and 1T-TaSe2
npj quantum materials, v 10(1), 31
20 Mar 2025
Abstract
1T-TaS2 is a non-magnetic Mott insulating transition-metal dichalcogenide with an odd number of electrons per unit cell, making it a potential spin-liquid candidate. This behavior arises from miniband reconstructions in the charge density wave state, producing a nearly flat band at half-filling. We revisit its electronic band structure using a nearest-neighbor tight-binding model, emphasizing the importance of often-neglected “spin-flip” terms in the spin-orbit coupling. By comparing with density functional theory calculations, we estimate the strength of these couplings. We also apply our theory to 1T-TaSe2, which is found to be a promising candidate for a topologically non-trivial flat band. Our findings have significant implications for correlated physics in the flat band, including the emergent spin-spin Hamiltonian at half-filling, identified as a J-K-Γ-
model on a triangular lattice, and for tuning electronic properties away from half-filling.
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Details
- Title
- Flat band physics in the charge-density wave state of 1T-TaS2 and 1T-TaSe2
- Creators
- Amir Dalal - Bar-Ilan UniversityJonathan Ruhman - Bar-Ilan UniversityJörn W. F. Venderbos - Drexel University
- Publication Details
- npj quantum materials, v 10(1), 31
- Publisher
- Nature Publishing Group
- Number of pages
- 11
- Grant note
- 3467/21 / Israel Science Foundation (ISF) (501100003977) DMR-2144352 / National Science Foundation (NSF) (100000001)
- Resource Type
- Journal article
- Language
- English
- Academic Unit
- Physics; Materials Science and Engineering
- Web of Science ID
- WOS:001448952800001
- Scopus ID
- 2-s2.0-105000480661
- Other Identifier
- 991022041190304721
InCites Highlights
Data related to this publication, from InCites Benchmarking & Analytics tool:
- Collaboration types
- Domestic collaboration
- International collaboration
- Web of Science research areas
- Materials Science, Multidisciplinary
- Physics, Applied
- Physics, Condensed Matter
- Quantum Science & Technology