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Topological effects in edge states are clearly visible on short lengths only,thus largely impeding their studies. On larger distances, one may be able todynamically enhance topological signatures by exploiting the high mobility ofedge states with respect to bulk carriers. Our work on microwave spectroscopyhighlights the responses of the edges which host very mobile carriers, whilebulk carriers are drastically slowed down in the gap. Though the edges aredenser than expected, we establish that charge relaxation occurs on shorttimescales, and suggests that edge states can be addressed selectively ontimescales over which bulk carriers are frozen.

Dynamical separation of bulk and edge transport in HgTe-based 2D topological insulators