Fig. 3: Electronic structures and evidence for the temperature-dependent chemical potential shift of NbIrTe4.
From: Spin-orbit-splitting-driven nonlinear Hall effect in NbIrTe4
a The surface Brillouin zone of NbIrTe4 with high-symmetry points marked as red points. The blue arrow represents the BCD (D). b ARPES and calculated (red dotted lines) Fermi surface (FS) of NbIrTe4 through two Brillouin zones (green solid lines) at 20 K. Ma is a mirror plane. c ARPES intensity plots with the calculated band structure (red dotted lines) and corresponding second-derivatives ARPES spectra for the enhanced visibility along the \(\bar{{{{{{\rm{X}}}}}}}\)-\(\bar{\Gamma }\)-\(\bar{{{{{{\rm{X}}}}}}}\) and \(\bar{{{{{{\rm{S}}}}}}}\)-\(\bar{{{{{{\rm{Y}}}}}}}\)-\(\bar{{{{{{\rm{S}}}}}}}\) directions at 20 K. d The energy distribution curves (EDCs) at the \(\bar{{{{{\Gamma}}}}}\) point as a function of temperature along with black fitted curves. The multi-peak fits are obtained by multiplication of the Fermi–Dirac distribution function and convolution of instrumental resolution with Lorentzian curves (detailed in Fig. S7). Blue dotted lines are the position of the two EDC peaks at E − EF = − 0.3, −1.0 eV, respectively (where EF is the Fermi energy). e Temperature dependence of the energy shifts ∆E (left axis) are taken from the peak position shift of EDCs at \(\bar{{{{{\Gamma}}}}}\) (∆E = E − ET=20 K) point obtained by multi-peak fit (see Supplementary Fig. 7). Hole carrier density (n, right axis) is obtained from the reported Hall measurement31. All error bars are defined as the standard deviation of fitting the position of the peaks.
