Figure 4: Temperature-dependent spectra and first-principles calculations.
From: Observation of the spin-polarized surface state in a noncentrosymmetric superconductor BiPd
(a) ARPES energy-momentum dispersion maps measured using a photon energy of 30 eV along the 
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momentum space cut-direction with varying temperatures. The measured values of temperature are noted on the plots. The panel with the note of Re_20K is the spectrum measured after thermal cycling (20→300→20 K). These data were collected at SSRL BL5-4 with a photon energy of 30 eV. (b) Slab calculations of BiPd for the top surface and (c) the bottom surface along the high-symmetry lines. The blue (red) dots represent surface states for the top (bottom) surface. Details of the calculation method is given in the Method section and additional calculation plots are shown in Supplementary Information.
