Layer Hall effect in a 2D topological axion antiferromagnet

Gao, Anyuan1; Liu, Yu-Fei1; Hu, Chaowei2,3; Qiu, Jian-Xiang1; Tzschaschel, Christian1; Ghosh, Barun4,5; Ho, Sheng-Chin1; Berube, Damien1; Chen, Rui6,7; Sun, Haipeng6,7; Zhang, Zhaowei8; Zhang, Xin-Yue9; Wang, Yu-Xuan9; Wang, Naizhou8; Huang, Zumeng8; Felser, Claudia10; Agarwal, Amit4; Ding, Thomas9; Tien, Hung-Ju11; Akey, Austin12; Gardener, Jules12; Singh, Bahadur13; Watanabe, Kenji14; Taniguchi, Takashi15; Burch, Kenneth S.9; Bell, David C.12,16; Zhou, Brian B.9; Gao, Weibo8; Lu, Hai-Zhou6,7; Bansil, Arun5; Lin, Hsin17; Chang, Tay-Rong11,18,19; Fu, Liang20; Ma, Qiong9; Ni, Ni2,3; Xu, Su-Yang1

2021-07-22

10.1038/s41586-021-03679-w

NATURE   影响因子和分区

0028-0836

1476-4687

Whereas ferromagnets have been known and used for millennia, antiferromagnets were only discovered in the 1930s(1). At large scale, because of the absence of global magnetization, antiferromagnets may seem to behave like any non-magnetic material. At the microscopic level, however, the opposite alignment of spins forms a rich internal structure. In topological antiferromagnets, this internal structure leads to the possibility that the property known as the Berry phase can acquire distinct spatial textures(2,3). Here we study this possibility in an antiferromagnetic axion insulator-even-layered, two-dimensional MnBi2Te4-in which spatial degrees of freedom correspond to different layers. We observe a type of Hall effect-the layer Hall effect-in which electrons from the top and bottom layers spontaneously deflect in opposite directions. Specifically, under zero electric field, even-layered MnBi2Te4 shows no anomalous Hall effect. However, applying an electric field leads to the emergence of a large, layer-polarized anomalous Hall effect of about 0.5e(2)/h (where e is the electron charge and h is Planck's constant). This layer Hall effect uncovers an unusual layer-locked Berry curvature, which serves to characterize the axion insulator state. Moreover, we find that the layer-locked Berry curvature can be manipulated by the axion field formed from the dot product of the electric and magnetic field vectors. Our results offer new pathways to detect and manipulate the internal spatial structure of fully compensated topological antiferromagnets(4-9). The layer-locked Berry curvature represents a first step towards spatial engineering of the Berry phase through effects such as layer-specific moire potential.

SCI

英语

NI论文 ; ESI高被引

其他

Center for the Advancement of Topological Semimetals (CATS), an Energy Frontier Research Center (EFRC) - US Department of Energy (DOE) Office of Science, through the Ames Laboratory[DE-AC0207CH11358] ; STC Center for Integrated Quantum Materials (CIQM), National Science Foundation (NSF)[ECCS-2025158] ; CATS, an EFRC - US DOE Office of Science, through the Ames Laboratory[DE-AC0207CH11358] ; Swiss National Science Foundation[P2EZP2_191801] ; NSF[1541959,"ECCS-2041779"] ; US DOE, Office of Science, Office of Basic Energy Sciences (BES)[DE-SC0021117] ; Air Force Office of Scientific Research[FA955-20-1-0322] ; Ministry of Science and Technology (MOST) in Taiwan[MOST110-2636-M-006-016] ; MOST, Taiwan["MOST107-2627-E-006-001","MOST 109-2112-M-001014-MY3"] ; National Natural Science Foundation of China[11925402] ; Guangdong province["2016ZT06D348","2020KCXTD001"] ; National Key RD Program[2016YFA0301700] ; Shenzhen High-level Special Fund["G02206304","G02206404"] ; Science, Technology and Innovation Commission of Shenzhen Municipality["ZDSYS20170303165926217","JCYJ20170412152620376","KYTDPT20181011104202253"] ; China Postdoctoral Science Foundation[2019M661678] ; ERC Advanced Grant[742068] ; Deutsche Forschungsgemeinschaft (German Research Foundation) under Germany's Excellence Strategy through Wurzburg-Dresden Cluster of Excellence on Complexity and Topology in Quantum Matter-ct.qmat["EXC 2147",390858490] ; Office of Naval Research[N00014-20-1-2308] ; Elemental Strategy Initiative by MEXT, Japan[JPMXP0112101001] ; JSPS KAKENHI[JP20H00354] ; Singapore National Research Foundation through its Competitive Research Program (CRP)["NRF-CRP21-2018-0007","NRF-CRP22-2019-0004"]

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WOS:000675577400011

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Web of Science

1.Harvard Univ, Dept Chem & Chem Biol, Cambridge, MA 02138 USA
2.Univ Calif Los Angeles, Dept Phys & Astron, Los Angeles, CA 90095 USA
3.Univ Calif Los Angeles, Calif NanoSyst Inst, Los Angeles, CA 90095 USA
4.Indian Inst Technol, Dept Phys, Kanpur, Uttar Pradesh, India
5.Northeastern Univ, Dept Phys, Boston, MA 02115 USA
6.Southern Univ Sci & Technol SUSTech, Shenzhen Inst Quantum Sci & Engn, Shenzhen, Peoples R China
7.Southern Univ Sci & Technol SUSTech, Dept Phys, Shenzhen, Peoples R China
8.Nanyang Technol Univ, Sch Phys & Math Sci, Div Phys & Appl Phys, Singapore, Singapore
9.Boston Coll, Dept Phys, Chestnut Hill, MA 02167 USA
10.Max Planck Inst Chem Phys Solids, Dresden, Germany
11.Natl Cheng Kung Univ, Dept Phys, Tainan, Taiwan
12.Harvard Univ, Ctr Nanoscale Syst, Cambridge, MA 02138 USA
13.Tata Inst Fundamental Res, Dept Condensed Matter Phys & Mat Sci, Mumbai, Maharashtra, India
14.Natl Inst Mat Sci, Res Ctr Funct Mat, Tsukuba, Ibaraki, Japan
15.Natl Inst Mat Sci, Int Ctr Mat Nanoarchitecton, Tsukuba, Ibaraki, Japan
16.Harvard Univ, Harvard John A Paulson Sch Engn & Appl Sci, Cambridge, MA 02138 USA
17.Acad Sinica, Inst Phys, Taipei, Taiwan
18.Ctr Quantum Frontiers Res & Technol QFt, Tainan, Taiwan
19.Natl Taiwan Univ, Natl Ctr Theoret Sci, Phys Div, Taipei, Taiwan
20.MIT, Dept Phys, Cambridge, MA 02139 USA

Gao, Anyuan,Liu, Yu-Fei,Hu, Chaowei,et al. Layer Hall effect in a 2D topological axion antiferromagnet[J]. NATURE,2021,595(7868).

Gao, Anyuan.,Liu, Yu-Fei.,Hu, Chaowei.,Qiu, Jian-Xiang.,Tzschaschel, Christian.,...&Xu, Su-Yang.(2021).Layer Hall effect in a 2D topological axion antiferromagnet.NATURE,595(7868).

Gao, Anyuan,et al."Layer Hall effect in a 2D topological axion antiferromagnet".NATURE 595.7868(2021).