Spectral signatures of a unique charge density wave in Ta₂NiSe₇.

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

SUBMITTER: Watson MD 

PROVIDER: S-EPMC10256806 | biostudies-literature | 2023 Jun

REPOSITORIES: biostudies-literature