Two dimensional topological insulator in quantizing magnetic fields
E.B. Olshanetsky, Z.D. Kvon, G.M. Gusev, N.N. Mikhailov, S.A., Dvoretsky
TL;DR
This paper investigates how strong magnetic fields affect electron transport in a 2D topological insulator, revealing a transition from helical edge state conduction to a gapped insulating state around 6 Tesla.
Contribution
It provides experimental evidence of the magnetic field-induced transition in a 2D topological insulator and confirms theoretical predictions about edge state persistence and gap opening.
Findings
Metal-insulator transition at B≈6 T
Edge states persist up to a critical magnetic field
Gap opens in the spectrum beyond B_c
Abstract
The effect of quantizing magnetic field on the electron transport is investigated in a two dimensional topological insulator (2D TI) based on a 8 nm (013) HgTe quantum well (QW). The local resistance behavior is indicative of a metal-insulator transition at T. On the whole the experimental data agrees with the theory according to which the helical edge states transport in a 2D TI persists from zero up to a critical magnetic field after which a gap opens up in the 2D TI spectrum.
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