Fig. 3

Distinct band dispersions along \({\bar{\mathrm \Gamma }} - {\bar{\mathrm X}}\) and \({\bar{\mathrm \Gamma }} - {\bar{\mathrm Y}}\). a High-symmetry dispersion before applying strain and b, c equivalent measurements on the same sample after straining, which is now in a detwinned state, with the sample oriented along \({\bar{\mathrm \Gamma }} - {\bar{\mathrm Y}}\) and \({\bar{\mathrm \Gamma }} - {\bar{\mathrm X}}\) respectively. The difference between the two orientations is particularly prominent at the k-point labelled by the starred arrow, from which the EDCs in d are extracted, showing an apparent ~70 meV energy scale. e Measurement with equivalent geometry to c but with LV light polarisation, which highlights other states including a band (κ) with mainly d_xy character. The states labelled κ and ε are also marked in Fig. 4c and referred to in the main text. All measurements performed using hν = 62 eV at 7–10 K