2020年4月21日
Magnetic-field-induced topological phase transition in Fe-doped (Bi,Sb)2Se3 heterostructures
Physical Review Materials
- 巻
- 4
- 号
- 4
- 記述言語
- 英語
- 掲載種別
- 研究論文(学術雑誌)
- DOI
- 10.1103/physrevmaterials.4.044202
- 出版者・発行元
- American Physical Society (APS)
Three-dimensional topological insulators (3D TIs) possess a specific topological order of electronic bands, resulting in gapless surface states via bulk-edge correspondence. Exotic phenomena have been realized in ferromagnetic TIs, such as the quantum anomalous Hall (QAH) effect with a chiral-edge conduction and a quantized value of the Hall resistance R-yx. Here, we report on the emergence of distinct topological phases in paramagnetic Fe-doped (Bi,Sb)(2)Se-3 heterostructures with varying structure architecture, doping, and magnetic and electric fields. Starting from a 3D TI, a two-dimensional insulator appears at layer thicknesses below a critical value, which turns into an Anderson insulator for Fe concentrations sufficiently large to produce localization by magnetic disorder. With applying a magnetic field, a topological transition from the Anderson insulator to the QAH state occurs, which is driven by the formation of an exchange gap owing to a giant Zeeman splitting and reduced magnetic disorder. A topological phase diagram of (Bi,Sb)(2)Se-3 allows exploration of intricate interplay of topological protection, magnetic disorder, and exchange splitting.
- リンク情報
-
- DOI
- https://doi.org/10.1103/physrevmaterials.4.044202
- Web of Science
- https://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcAuth=JSTA_CEL&SrcApp=J_Gate_JST&DestLinkType=FullRecord&KeyUT=WOS:000527142300001&DestApp=WOS_CPL
- URL
- https://link.aps.org/accepted/10.1103/PhysRevMaterials.4.044202
- URL
- https://link.aps.org/article/10.1103/PhysRevMaterials.4.044202
- URL
- http://harvest.aps.org/v2/journals/articles/10.1103/PhysRevMaterials.4.044202/fulltext
- ID情報
-
- DOI : 10.1103/physrevmaterials.4.044202
- ISSN : 2475-9953
- eISSN : 2475-9953
- Web of Science ID : WOS:000527142300001