0 π −π π y ( µ m ) y ( µ m ) arg( h K ) |h$_{K}$| |h$_{K}$| |h$_{K}$| 0.4 π -0.4 π arg( h K ) arg( h K ) (a) (b) (e) (c) (d) (f) -0.4 -0.2 0.0 0.2 0.4 0.0 1.0 -0.4 -0.2 0.0 0.2 0.4 y ( µ m ) -0.4 -0.2 0.0 0.2 0.4 0.0 1.0 y ( µ m ) -0.4 -0.2 0.0 0.2 0.4 0.0 1.2 y ( µ m ) -0.4 -0.2 0.0 0.2 0.4 y ( µ m ) -0.4 -0.2 0.0 0.2 0.4 k p  = 8.737 ( ), 8.620 ( ) ( ) , 8.503 k p  = 8.301 ( ), 8.100 ( ) ( ) , 7.899 k p  = 5.125 ( ), 4.849 ( ) ( ) , 4.571 FIG. 4. Behavior of the complex amplitude (left column) and argument (right column) of the wavefunction h$_{K}$ at different values of k$_{‖}$ and positive K corresponding to the first band (top), second band (middle) and third band (bottom). 26