Extended Data Fig. 1: RuO2 plane, with dxy−p hybridizing orbitals and experimental setup.
a, Ru dxy and hybridizing O p orbitals at the Y point, which dominate the formation of the γ band. NMR shifts are measured at the O(1) and O(1′) sites. b, Compressive a-axis stress shifts the γ-band Fermi surface to the zone boundary at Y. vHs, van Hove singularity. c, Strain device. The enlarged view highlights the Sr2RuO4 single crystal mounted between the piezoelectric actuators, with B0 parallel to the b axis and the compressive stress along the a axis, εaa. The NMR coil covers the free part of ~1 mm length.
