Current-Driven Instability of the Quantum Anomalous Hall Effect in Ferromagnetic Topological Insulators

Minoru Kawamura, Ryutaro Yoshimi, Atsushi Tsukazaki, Kei S. Takahashi, Masashi Kawasaki, Yoshinori Tokura

Research output: Contribution to journalArticlepeer-review

10 Citations (Scopus)

Abstract

The instability of the quantum anomalous Hall (QAH) effect has been studied as a function of the electric current and temperature in ferromagnetic topological insulator thin films. We find that a characteristic current for the breakdown of the QAH effect is roughly proportional to the Hall-bar width, indicating that the Hall electric field is relevant to the breakdown. We also find that electron transport is dominated by variable range hopping (VRH) at low temperatures. Combining the current and temperature dependences of the conductivity in the VRH regime, the localization length of the QAH state is evaluated to be about 5 μm. The long localization length suggests a marginally insulating nature of the QAH state due to a large number of in-gap states.

Original languageEnglish
Article number016803
JournalPhysical review letters
Volume119
Issue number1
DOIs
Publication statusPublished - 2017 Jul 7

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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