Spectral signatures of a unique charge density wave in Ta<sub>2</sub>NiSe<sub>7</sub>.
basic_science · Level V
Where this comes from
- Record sourced from PubMed, PMID 37296116.
- Also identified by DOI 10.1038/s41467-023-39114-z and PMC identifier 10256806.
- Licence recorded as CC BY.
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Abstract
Charge Density Waves (CDW) are commonly associated with the presence of near-Fermi level states which are separated from others, or "nested", by a wavector of q. Here we use Angle-Resolved Photo Emission Spectroscopy (ARPES) on the CDW material Ta<sub>2</sub>NiSe<sub>7</sub> and identify a total absence of any plausible nesting of states at the primary CDW wavevector q. Nevertheless we observe spectral intensity on replicas of the hole-like valence bands, shifted by a wavevector of q, which appears with the CDW transition. In contrast, we find that there is a possible nesting at 2q, and associate the characters of these bands with the reported atomic modulations at 2q. Our comprehensive electronic structure perspective shows that the CDW-like transition of Ta<sub>2</sub>NiSe<sub>7</sub> is unique, with the primary wavevector q being unrelated to any low-energy states, but suggests that the reported modulation at 2q, which would plausibly connect low-energy states, might be more important for the overall energetics of the problem.