Fig. 5.
The opposite-flux method for dispersive systems. (A) Evolution of the difference 
, for the same configuration as in Fig. 3. This method yields a clear manifestation of the edge states, 
, by eliminating the undesired contribution of the many bulk states. The edge states chirality is deduced from the evolution of the red and blue patterns. (B) The edge-states contribution 
for 
and (C) for 
. In the central column, we note the vanishing of the signal 
that occurs at time 
, indicating that the edge states angular velocity is 
for 
and 
(SI Appendix).