Fig. 4: Theoretical analysis of ANE and AHE conductivity.
From: Giant anomalous Nernst signal in the antiferromagnet YbMnBi2
a,b, Band structure of YbMnBi2 (a) (in which the different coloured lines denote the contribution from different orbitals from Mn and Bi elements) and Berry curvature distribution (b) in the Brillouin zone calculated from first principles by assuming θ = 10°. The total Berry curvature contribution from the electron pockets is negative. With a larger spin θ, the d orbitals of Mn join the conduction, and an additional negative Berry curvature is generated at the Г point. c, Left: ARPES intensity at EF as a function of the ab plane wavevectors (kx and ky) measured with 55 eV photons at T = 19 K. The ARPES intensity is integrated over the energy range of +10 meV to −10 meV with respect to EF. The inset shows two pairs of Weyl nodes. Right: the calculated band variation at the Г point with increasing θ. d, Calculated |σAHE| as a function of θ. The solid line shows the calculated results, and the dashed line shows a linear extrapolation. e,f, Experimental results for the temperature dependence of |σAHE| (e) and |αANE| (f) in cb (V//c) and bc (V//b). Calculated |αANE| values at different EF are shown by the dashed lines in f.
