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Spectral signatures of a unique charge density wave in Ta2NiSe7

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Title
Spectral signatures of a unique charge density wave in Ta2NiSe7
Author(s)
Watson, Matthew D.; Louat, Alex; Cacho, Cephise; Sungkyun Choi; Young Hee Lee; Michael Neumann; Gideok Kim
Publication Date
2023-06
Journal
Nature Communications, v.14, no.1
Publisher
Nature Research
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 Ta2NiSe7 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 Ta2NiSe7 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. © 2023, The Author(s).
URI
https://pr.ibs.re.kr/handle/8788114/13552
DOI
10.1038/s41467-023-39114-z
ISSN
2041-1723
Appears in Collections:
Center for Integrated Nanostructure Physics(나노구조물리 연구단) > 1. Journal Papers (저널논문)
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