Fig. 3: Evolution of energy spectra of domain wall states with respect to the interchain coupling. | Communications Physics

Fig. 3: Evolution of energy spectra of domain wall states with respect to the interchain coupling.

From: Revealing inverted chirality of hidden domain wall states in multiband systems without topological transition

Fig. 3

Energy spectra for a AA-BA, b AA-AB, and c AA-BB domain walls. Solid and dotted lines represent the in-gap domain wall states and hidden domain wall states, respectively. Two domain wall states exist in the lower gap regardless of α/t. When the upper gap opens, a hidden domain wall state appears for all cases. Indirect gaps exist between dashed lines (α1 < α < α2) while direct gaps exist when α ≥ α2. Here, δ/t = 0.3. As the hidden domain wall state approaches either conduction band minima or valence band maxima, pinpointing its exact position becomes challenging.

Back to article page