期刊
PHYSICAL REVIEW X
卷 9, 期 4, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevX.9.041049
关键词
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资金
- U.S. Department of Energy, Office of Science, Office of Basic Energy Sciences, Materials Sciences and Engineering Division within the Quantum Materials Program [DE-AC02-05-CH11231, KC2202]
- U.S. Department of Energy, Office of Basic Energy Sciences
- Robert A. Welch Foundation [C-2024, C-1839, C-1411]
- Alfred P. Sloan Foundation
- DOE Office of Basic Energy Sciences, Division of Materials Sciences
- U.S. DOE, BES [DE-SC0012311]
- U.S. Department of Energy, Office of Science, Basic Energy Sciences [DE-SC0018197]
- National Science Foundation of China [11374361, 11674392]
- Ministry of Science and Technology of China, National Program on Key Research Project [2016YFA0300504]
- German Science Foundation (DFG) [PF 947/1-1]
- Miller Institute for Basic Research in Science
Superconductivity emerges in proximity to a nematic phase in most iron-based superconductors. It is therefore important to understand the impact of nematicity on the electronic structure. Orbital assignment and tracking across the nematic phase transition prove to be challenging due to the multiband nature of iron-based superconductors and twinning effects. Here, we report a detailed study of the electronic structure of fully detwinned FeSe across the nematic phase transition using angle-resolved photoemission spectroscopy. We clearly observe a nematicity-driven band reconstruction involving d(xz), d(yz), and d(xy) orbitals. The nematic energy scale between d(xz) and d(yz) bands reaches a maximum of 50 meV at the Brillouin zone corner. We are also able to track the d(xz) electron pocket across the nematic transition and explain its absence in the nematic state. Our comprehensive data of the electronic structure provide an accurate basis for theoretical models of the superconducting pairing in FeSe.
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