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Dynamical separation of bulk and edge transport in HgTe-based 2D topological insulators
Physical Review Letters ( IF 9.227 ) Pub Date : 
Matthieu C. Dartiailh, Simon Hartinger, Alexandre Gourmelon, Kalle Bendias, Hugo Bartolomei, Hiroshi Kamata, Jean-Marc Berroir, Gwendal Fève, Bernard Plaçais, Lukas Lunczer, Raimund Schlereth, Hartmut Buhmann, Laurens W. Molenkamp, and Erwann Bocquillon

Topological effects in edge states are clearly visible on short lengths only, thus largely impeding their studies. On larger distances, one may be able to dynamically enhance topological signatures by exploiting the high mobility of edge states with respect to bulk carriers. Our work on microwave spectroscopy highlights the responses of the edges which host very mobile carriers, while bulk carriers are drastically slowed down in the gap. Though the edges are denser than expected, we establish that charge relaxation occurs on short timescales, and suggests that edge states can be addressed selectively on timescales over which bulk carriers are frozen.
更新日期:2020-01-14

 

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