Fig. 5: Metallic surface state of alkali-metal dosed Ca2RuO4.
From: Orbital-selective metal skin induced by alkali-metal-dosing Mott-insulating Ca2RuO4
a Constant-energy map of pristine Ca2RuO4 at E = EF − 5.1 eV recorded with hν = 90 eV, p-polarized photons at the temperature of T = 150 K. The oxygen bands draw a periodic structure. Overlaid gray solid and dashed squares represent Brillouin zones in the tetragonal and orthorhombic notations, respectively. b Fermi surface after K dosing for 10 min at 6.5 A. The color bar quantifies photoemission intensity. c–e Energy distribution maps (EDMs) recorded with circular, p, and s polarization, respectively, along the cut indicated in (b). The band becomes indiscernible when measured with s-polarized light. f EDM of the K-dosed state [identical to K-3 in Fig. 2c] overlaid with momentum-distribution-curve (MDC) peak positions, recorded with hν = 31 eV, p-polarized photons along the cut shown in the inset. g MDC full width at half maximum averaged over the two branches. The dashed curve indicates the low-energy dependence to guide the eye. Kinks in the MDC peak position and width are indicated by arrows. Error bars are based on the standard deviation of the fitting.
