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    Berry Phase Engineering in SrRuO3/SrIrO3/SrTiO3 Superlattices Induced by Band Structure Reconstruction

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    Embargo End Date:
    2022-02-19
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    Type
    Article
    Authors
    Zheng, Dongxing
    Fang, Yue-Wen cc
    Zhang, Senfu cc
    Li, Peng cc
    Wen, Yan cc
    Fang, Bin
    He, Xin cc
    Li, Yan
    Zhang, Chenhui cc
    Tong, Wenyi
    Mi, Wenbo cc
    Bai, Haili cc
    Alshareef, Husam N. cc
    Qiu, Z. Q. cc
    Zhang, Xixiang cc
    KAUST Department
    Physical Science and Engineering (PSE) Division
    Material Science and Engineering Program
    Material Science and Engineering
    KAUST Grant Number
    CRF-2015-SENSORS-2708
    OSR-2017-CRG6-3427
    OSR2019-CRG8-4801
    Date
    2021-02-19
    Embargo End Date
    2022-02-19
    Submitted Date
    2020-12-06
    Permanent link to this record
    http://hdl.handle.net/10754/667517
    
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    Abstract
    The Berry phase, which reveals the intimate geometrical structure underlying quantum mechanics, plays a central role in the anomalous Hall effect. In this work, we observed a sign change of Berry curvatures at the interface between the ferromagnet SrRuO3 (SRO) layer and the SrIrO3 (SIO) layer with strong spin-orbit coupling. The negative Berry curvature at the interface, induced by the strongly spin-orbit-coupled Ir 5d bands near the Fermi level, makes the SRO/SIO interface different from the SRO layer that has a positive Berry curvature. These opposite Berry curvatures led to two anomalous Hall effect (AHE) channels with opposite signs at the SRO/SIO interface and in the SRO layer, respectively, resulting in a hump-like feature in the Hall resistivity loop. This observation offers a straightforward explanation of the hump-like feature that is usually associated with the chiral magnetic structure or magnetic skyrmions. Hence, this study provides evidence to oppose the widely accepted claim that magnetic skyrmions induce the hump-like feature.
    Citation
    Zheng, D., Fang, Y.-W., Zhang, S., Li, P., Wen, Y., Fang, B., … Zhang, X. (2021). Berry Phase Engineering in SrRuO3/SrIrO3/SrTiO3 Superlattices Induced by Band Structure Reconstruction. ACS Nano. doi:10.1021/acsnano.0c10200
    Sponsors
    This publication is based on research supported by the King Abdullah University of Science and Technology (KAUST), Office of Sponsored Research (OSR), under award Nos. OSR2019-CRG8-4801, OSR-2017-CRG6-3427, and CRF-2015-SENSORS-2708. D.X.Z and H.L.B. acknowledge financial support from the National Natural Science Foundation of China (11704278, 51772207, and 11434006) and Natural Science Foundation of Tianjin City (19JCQNJC03000). Z.Q.Q. acknowledges financial support from the U.S. Department of Energy, Office of Science, Office of Basic Energy Sciences, Materials Sciences and Engineering Division, under Contract No. DE-AC02-05CH11231 (van der Waals heterostructures program, KCWF16). Computational resources were provided by the New York University Shanghai.
    Publisher
    American Chemical Society (ACS)
    Journal
    ACS Nano
    DOI
    10.1021/acsnano.0c10200
    PubMed ID
    33606942
    Additional Links
    https://pubs.acs.org/doi/10.1021/acsnano.0c10200
    ae974a485f413a2113503eed53cd6c53
    10.1021/acsnano.0c10200
    Scopus Count
    Collections
    Articles; Physical Science and Engineering (PSE) Division; Material Science and Engineering Program

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