Persistence of a two-dimensional topological insulator state in wide HgTe quantum wells

Phys Rev Lett. 2015 Mar 27;114(12):126802. doi: 10.1103/PhysRevLett.114.126802. Epub 2015 Mar 24.

Abstract

Our experimental studies of electron transport in wide (14 nm) HgTe quantum wells confirm the persistence of a two-dimensional topological insulator state reported previously for narrower wells, where it was justified theoretically. Comparison of local and nonlocal resistance measurements indicate edge state transport in the samples of about 1 mm size at temperatures below 1 K. Temperature dependence of the resistances suggests an insulating gap of the order of a few meV. In samples with sizes smaller than 10 μm a quasiballistic transport via the edge states is observed.