Extended Data Fig. 8: Γ-pocket Fermi surface fitting based on the model of Methods Section F, Eq. (7).
From: Magnetic field-induced momentum-dependent symmetry breaking in a kagome superconductor
(a) Fermi pocket diameter as a function of the azimuthal angle obtained by fitting the radial MDCs without and with a magnetic field. The curves at -1.6 mT and 1.6 mT are offset for clarity with the reference lines shown for each. Error bars represent the standard deviation of the Lorentzian fits to the corresponding MDC peaks along different Fermi surface directions with 95% confidence interval. (b) Square of the Fermi momentum for -1.6 mT normalized by the zero field value overlaid with the fitting results using Eq. 7. Error bars are derived from the corresponding error bars in (a). (c) Fermi pocket diameter for -1.6 mT and 1.6 mT normalized by its zero-field value measured at 35 K. Error bars are derived from the corresponding error bars in (a). All curves are fitted with the function A + B \(\cos\)(2(θ + π)). The red and blue dashed lines indicate the deviation of the long axes of the elliptical Fermi pockets away from the K point at -1.6 mT (6.9∘) and 1.6 mT (2.3∘), respectively.
