Extended Data Fig. 5: Additional spectroscopic line-cuts across the domain wall.
From: Interacting multi-channel topological boundary modes in a quantum Hall valley system
a–f, Spectroscopic line-cuts across the \(\widetilde{\nu }=2\) domain wall. The six different line-cut trajectories are indicated by the dashed lines in m. Although minor variations in the spectra are seen, probably due to the effects of local disorder, the key features of exchange gap closing and Landau level crossing at the domain wall are consistent. g–l, Spectroscopic line-cuts across the \(\widetilde{\nu }=1\) domain wall. Again, the same features of the change in topological invariant are present in each line-cut. m, n, dI/dV maps reproduced from Fig. 2c and Fig. 2e, respectively, overlaid with dashed lines showing the locations of the spectroscopic line-cuts in a–l.
