Fig. 2: Electronic structure of CsCr3Sb5.
From: Spin excitations and flat electronic bands in a Cr-based kagome superconductor
A DFT-calculated band structure of CsCr3Sb5. B DFT-calculated band structure of CsV3Sb5. In (A) and (B), red arrows mark the energy position of the flat bands (FB) while red circles mark the positions of the VHSs in both CsCr3Sb5 and CsV3Sb5. C Comparison of the DOS of CsCr3Sb5 (cyan) and CsV3Sb5 (orange), whose FB energy positions are indicated by the red arrows, respectively. D Fermi surface of CsCr3Sb5 measured with 102 eV photons on the left and DFT calculation on the right. Red solid lines mark the 2D projected BZ. Blue arrows denote the light polarization. E Same as (D) but at EB = 0.5 eV. The black dashed circles mark the position of the VHS at the M point. F The definition and illustration of the orbitals in CsCr3Sb5. G–J band dispersion taken with 114 eV (G)(H) LV and (I)(J) LH polarization along the \(\bar{\Gamma }\)-\(\bar{K}\)-\(\bar{M}\)-\(\bar{K}\) and \(\bar{\Gamma }\)-\(\bar{M}\)-\(\bar{\Gamma }\) directions. The DFT calculations projected onto the orbitals observable in each measurement geometry, according to the selection rules, are overlapped on the band dispersions for comparison. Blue arrows denote the polarization direction. The white solid arrow denotes the dyz character band position, while the white dashed arrow denotes its position in the observation, suggesting a possible orbital-selective band renormalization for dyz orbitals. K Band dispersions measured with 100 eV photons (kz = 0) along \(\bar{\Gamma }\)-\(\bar{M}\). The measurement geometry and polarization are as marked. L EDCs stacking in band dispersions taken with LH polarization at in (K). M Same as (L) but taken with LV polarization. Lines of the same colors in (K–M) denote high symmetry point positions.
