期刊
NATURE COMMUNICATIONS
卷 12, 期 1, 页码 -出版社
NATURE RESEARCH
DOI: 10.1038/s41467-020-20349-z
关键词
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资金
- DOE [DE-SC0019064]
- ARO Young Investigator Program Award [W911NF1810198]
- Gordon and Betty Moore Foundation's EPiQS Initiative [GBMF9063]
- National Natural Science Foundation of China [11674165, 12074181, 11834006, 52073075]
- Natural Science Foundation of Jiangsu Province [BK20200007]
- Fok Ying-Tung Education Foundation of China [161006]
- Fundamental Research Funds for the Central Universities [020414380149]
- Penn State 2DCC-MIP under NSF [DMR-1539916]
- Shenzhen Science and Technology Progam [KQTD20170809110344233]
- National Key R & D Program of China [2017YFA0206302]
- U.S. Department of Defense (DOD) [W911NF1810198] Funding Source: U.S. Department of Defense (DOD)
This study reports a sign change in the anomalous Hall effect resulting from Berry curvature change at the interface of a topological insulator/magnetic topological insulator heterostructure.
The Berry phase picture provides important insights into the electronic properties of condensed matter systems. The intrinsic anomalous Hall (AH) effect can be understood as the consequence of non-zero Berry curvature in momentum space. Here, we fabricate TI/magnetic TI heterostructures and find that the sign of the AH effect in the magnetic TI layer can be changed from being positive to negative with increasing the thickness of the top TI layer. Our first-principles calculations show that the built-in electric fields at the TI/magnetic TI interface influence the band structure of the magnetic TI layer, and thus lead to a reconstruction of the Berry curvature in the heterostructure samples. Based on the interface-induced AH effect with a negative sign in TI/V-doped TI bilayer structures, we create an artificial topological Hall effect-like feature in the Hall trace of the V-doped TI/TI/Cr-doped TI sandwich heterostructures. Our study provides a new route to create the Berry curvature change in magnetic topological materials that may lead to potential technological applications. Berry curvature connects to exotic electronic phases hence it provides important insights to understand quantum materials. Here, the authors report sign change of the anomalous Hall effect resulted from Berry curvature change at the interface of a topological insulator/magnetic topological insulator heterostructure.
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