Fermi surfaces, electron-hole asymmetry, and correlation kink in a three-dimensional Fermi liquid LaNiO3

We report the three-dimensional (3D) momentum-resolved soft x-ray photoemission spectroscopy of the Fermi liquid LaNiO3. The out-of-plane and in-plane cuts of the 3D electron- and hole-Fermi surfaces (FSs) are observed by energy- and angle-dependent photoemission measurements. The energy bands forming the electron FS suggest an ω2 dependence of the imaginary part of the self-energy and a "correlation kink" at an energy scale of 0.25 eV. In contrast, the bands which form nesting character hole FSs do not show kinks and match local-density approximation calculations. The results indicate a momentum-dependent mass renormalization, leading to electron-hole asymmetry in strongly correlated LaNiO3.