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- Title
Orbital-selective charge-density wave in TaTe<sub>4</sub>.
- Authors
Xu, R. Z.; Du, X.; Zhou, J. S.; Gu, X.; Zhang, Q. Q.; Li, Y. D.; Zhao, W. X.; Zheng, F. W.; Arita, M.; Shimada, K.; Kim, T. K.; Cacho, C.; Guo, Y. F.; Liu, Z. K.; Chen, Y. L.; Yang, L. X.
- Abstract
TaTe4, a metallic charge-density wave (CDW) material discovered decades ago, has attracted renewed attention due to its rich interesting properties, such as pressure-induced superconductivity and candidate nontrivial topological phase. Here, using high-resolution angle-resolved photoemission spectroscopy and ab initio calculation, we systematically investigate the electronic structure of TaTe4. At 26 K, we observe a CDW gap as large as 290 meV, which persists up to 500 K. The CDW-modulated band structure shows a complex reconstruction that closely correlates with the lattice distortion. Inside the CDW gap, there exist highly dispersive energy bands contributing to the remnant Fermi surface and metallic behavior in the CDW state. Interestingly, our ab initio calculation reveals that the large CDW gap mainly opens in the electronic states with out-of-plane orbital components, while the in-gap metallic states originate from in-plane orbitals, suggesting an orbital texture that couples with the CDW order. Our results shed light on the interplay between electron, lattice, and orbital in quasi-one-dimensional CDW materials.
- Subjects
AB-initio calculations; PHOTOELECTRON spectroscopy; FERMI surfaces; CHARGE density waves; ENERGY bands; TIME-resolved spectroscopy; METALLIC surfaces; PHOTOEMISSION
- Publication
NPJ Quantum Materials, 2023, Vol 8, Issue 1, p1
- ISSN
2397-4648
- Publication type
Article
- DOI
10.1038/s41535-023-00573-8