Fig. 4: Kramers nodal lines and electronic band structure in InTaS₂.

a Fermi surface (FS) of InTaS₂ measured by 74 eV p polarized photons (indicated at the bottom right of the panel) at 23.5 K. b FS calculated from first-principles using a superposition of both In and S terminations, where a surface onsite energy correction of −0.7 eV is applied to the In s orbitals and a +0.2 eV onto the Ta d orbitals. c Band dispersions along \(\bar{\Gamma }-\bar{M}-\bar{K}-\bar{\Gamma }\) measured by 74 eV photons, overlaid with bulk density functional theory (DFT) calculations at the k_z = 0 and π planes showing the Kramers nodal line behavior. d Surface calculation for the \(\bar{\Gamma }-\bar{M}-\bar{K}-\bar{\Gamma }\) projected onto the In termination is displayed for comparison, as the surface states from S termination have degraded for the angle-resolved photoemission spectroscopy (ARPES) data in (c). More details of the termination-dependent electronic band structure are elaborated in Supplementary Note 5. DFT calculations in comparison with ARPES data have no E_F adjustment.