Dynamical Separation of Bulk and Edge Transport in HgTe-Based 2D Topological Insulators

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 sp...

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Bibliographic Details
Published in:Physical review letters 2020-02, Vol.124 (7), p.076802-076802, Article 076802
Main Authors: Dartiailh, Matthieu C, Hartinger, Simon, Gourmelon, Alexandre, Bendias, Kalle, Bartolomei, Hugo, Kamata, Hiroshi, Berroir, Jean-Marc, Fève, Gwendal, Plaçais, Bernard, Lunczer, Lukas, Schlereth, Raimund, Buhmann, Hartmut, Molenkamp, Laurens W, Bocquillon, Erwann
Format: Article
Language:English
Subjects:
Condensed Matter
Mesoscopic Systems and Quantum Hall Effect
Physics
Topological insulators
Topology
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Summary: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 response 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 suggest that edge states can be addressed selectively on timescales over which bulk carriers are frozen.
ISSN:0031-9007
1079-7114
DOI:10.1103/PhysRevLett.124.076802