Spectral signatures of a unique charge density wave in Ta2NiSe7

Matthew D. Watson (), Alex Louat, Cephise Cacho, Sungkyun Choi, Young Hee Lee, Michael Neumann and Gideok Kim
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Matthew D. Watson: Diamond Light Source Ltd
Alex Louat: Diamond Light Source Ltd
Cephise Cacho: Diamond Light Source Ltd
Sungkyun Choi: Institute for Basic Science (IBS)
Young Hee Lee: Institute for Basic Science (IBS)
Michael Neumann: Institute for Basic Science (IBS)
Gideok Kim: Institute for Basic Science (IBS)

Nature Communications, 2023, vol. 14, issue 1, 1-7

Abstract: 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.

Date: 2023
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DOI: 10.1038/s41467-023-39114-z

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