Fig. 2: Orbital dependent EPC.
From: Testing electron–phonon coupling for the superconductivity in kagome metal CsV3Sb5
a Contours of the FSs and the momentum location of the cuts shown in (b). b ARPES intensity plots the α and β bands. The momentum is rescaled with respect to their kF. c Extracted band dispersions of the \(\alpha\) and \(\beta\) bands. The arrows show the energy position of the kinks. The black lines are the corresponding bare bands. d Extracted ReΣ(ω) of the α and β bands. The error bars for ReΣ(ω) are determined from standard deviation of the MDC fits, which is converted to energy by multiplying velocity of bare band. The black lines are the ReΣ(ω) reproduced by maximum entropy method. e Extracted Eliashberg coupling functions \({\alpha }^{2}F\left(\omega \right)\) for the α and β bands. f λp,d estimated from \({\alpha }^{2}F\left(\omega \right)\) (purple circles) and λdev defined by the slope of ReΣ(ω) at EF (black circles). The error bars are determined by the standard deviation of the ReΣ(ω).
