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Orbital-Dependent Electron Correlation in Double-Layer Nickelate La3Ni2O7

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arxiv 2309.01148 v2 pith:DIGNF74V submitted 2023-09-03 cond-mat.supr-con cond-mat.str-el

Jiangang Yang , Hualei Sun , Xunwu Hu , Yuyang Xie , Taimin Miao , Hailan Luo , Hao Chen , Bo Liang
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Wenpei Zhu Gexing Qu Cui-Qun Chen Mengwu Huo Yaobo Huang Shenjin Zhang Fengfeng Zhang Feng Yang Zhimin Wang Qinjun Peng Hanqing Mao Guodong Liu Zuyan Xu Tian Qian Dao-Xin Yao Meng Wang Lin Zhao X. J. Zhou
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classification cond-mat.supr-concond-mat.str-el
keywords la3ni2o7superconductivitybandelectronelectronichighstructuresunderstand
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The latest discovery of high temperature superconductivity near 80K in La3Ni2O7 under high pressure has attracted much attention. Many proposals are put forth to understand the origin of superconductivity.The determination of electronic structures is a prerequisite to establish theories to understand superconductivity in nickelates but is still lacking. Here we report our direct measurement of the electronic structures of La3Ni2O7 by high-resolution angle resolved photoemission spectroscopy. The Fermi surface and band structures of La3Ni2O7 are observed and compared with the band structure calculations. Strong electron correlations are revealed which are orbital- and momentum dependent. A flat band is formed from the Ni-3dz2 orbitals around the zone corner which is ~50meV below the Fermi level and exhibits the strongest electron correlation. In many theoretical proposals, this band is expected to play the dominant role in generating superconductivity in La3Ni2O7. Our observations provide key experimental information to understand the electronic structure and origin of high temperature superconductivity in La3Ni2O7.

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  1. Pressure and strain effects on the $\textit{ab initio}$ $GW$ electronic structure of La$_3$Ni$_2$O$_7$

    cond-mat.supr-con 2025-04 conditional novelty 6.0 of 10

    A one-shot GW calculation predicts that correlations remove the gamma hole pocket of La3Ni2O7 and that the La-5d x2-y2 band approaches the Fermi level under pressure and strain, matching ARPES without a Hubbard U.

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