Fig. 1: EPC-induced electronic kink in CsV3Sb5.
From: Testing electron–phonon coupling for the superconductivity in kagome metal CsV3Sb5
a Schematic temperature versus pressure/doping phase diagram. The inset shows the crystal structure of CsV3Sb5. A top view of the V-Sb layer is zoomed in on the right panel. b Schematic of van Hove singularities at the M point of the Brillouin zone boundary which are connected by three nesting wavevectors. The von Hove singularities has mainly V 3d orbital characters (\({d}_{{x}^{2}-{y}^{2}}\) and \({d}_{{yz}}\)). The circular electronic pocket at Γ point has mainly Sb 5pz orbital character. c FS mapping with intensity integrated within EF ± 5 meV. The FS sheet in ky < 0 is symmetrized from the one in ky > 0 and a superposed FS sheet is collected from another independent sample. Dashed lines are DFT determined FSs. d ARPES intensity plot, corresponding to the black cut in c, showing a kink in the band dispersion. The band dispersion extracted from the MDCs is overlaid as a red curve. The dashed black line represents the bare band. The arrow indicates the position of the kink. The MDC at EF and its Lorentzian fit are shown as yellow and black lines, respectively. e Real-part self-energy ReΣ(ω=E-EF) and imaginary-part self-energy ImΣ(ω=E-EF). A background of ImΣother is subtracted for ImΣ(ω) (see supplementary note 2). The dashed black line marks the energy position of the kink.
