@article{bca3066d448d48c1bd9a91044d0c2e2a,
title = "Interface-induced sign reversal of the anomalous Hall effect in magnetic topological insulator heterostructures",
abstract = "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.",
author = "Fei Wang and Xuepeng Wang and Zhao, {Yi Fan} and Di Xiao and Zhou, {Ling Jie} and Wei Liu and Zhidong Zhang and Weiwei Zhao and Chan, {Moses H.W.} and Nitin Samarth and Chaoxing Liu and Haijun Zhang and Chang, {Cui Zu}",
note = "Funding Information: The authors would like to thank W. D. Wu, D. Xiao, and X. D. Xu for helpful discussions. This work (transport measurements and data analysis) is primarily supported by the DOE grant (DE-SC0019064). The MBE growth of magnetic TI film/heterostructure samples is partially supported by ARO Young Investigator Program Award (W911NF1810198) and the Gordon and Betty Moore Foundation{\textquoteright}s EPiQS Initiative (Grant GBMF9063 to C.-Z.C.). H.Z. acknowledges support from the National Natural Science Foundation of China (11674165, 12074181, and 11834006), Natural Science Foundation of Jiangsu Province (BK20200007), the Fok Ying-Tung Education Foundation of China (161006), and the Fundamental Research Funds for the Central Universities (020414380149). N.S. acknowledges support from Penn State 2DCC-MIP under NSF grant DMR-1539916. W.Z. acknowledges support from the National Natural Science Foundation of China (52073075) and Shenzhen Science and Technology Progam (KQTD20170809110344233). F.W., W.L., and Z.Z. acknowledges support from the National Key R & D Program of China (2017YFA0206302).",
year = "2021",
month = dec,
doi = "10.1038/s41467-020-20349-z",
language = "English (US)",
volume = "12",
journal = "Nature Communications",
issn = "2041-1723",
publisher = "Nature Publishing Group",
number = "1",
}