Publication Date:
2016-09-27
Description:
Author(s): Y. Zhang, M. Yi, Z.-K. Liu, W. Li, J. J. Lee, R. G. Moore, M. Hashimoto, M. Nakajima, H. Eisaki, S.-K. Mo, Z. Hussain, T. P. Devereaux, Z.-X. Shen, and D. H. Lu The nematic state, where a system is translationally invariant but breaks rotational symmetry, has drawn great attention recently due to the experimental observations of such a state in high- T c superconductors. For iron-based superconductors, the nematic state intertwines strongly with the antiferromagnetic order. Hence, clear experimental delineation of the nematic state has always been challenging. Here, the authors study the electronic structure of a multilayer FeSe film using angle-resolved photoemission spectroscopy. The band reconstruction in the nematic state is clearly delineated. They find that the energy splitting between d x z and d y z bands shows a nonmonotonic distribution in momentum space. The energy splitting was also observed on the d x y bands with an energy scale around 45 meV. The momentum dependence of the d x z and d y z energy splitting and the reconstruction of d x y exclude the simple on-site ferro-orbital ordering as a driving force of nematicity. Instead, strong anisotropy exists in the hopping of all d x z , d y z , and d x y orbitals, the origin of which holds the key to a microscopic understanding of the nematicity in iron-based superconductors. [Phys. Rev. B 94, 115153] Published Mon Sep 26, 2016
Keywords:
Electronic structure and strongly correlated systems
Print ISSN:
1098-0121
Electronic ISSN:
1095-3795
Topics:
Physics
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