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

研究成果: Article査読

12 被引用数 (Scopus)

抄録

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.

本文言語English
論文番号016803
ジャーナルPhysical review letters
119
1
DOI
出版ステータスPublished - 2017 7 7

ASJC Scopus subject areas

  • 物理学および天文学(全般)

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