A van der Waals antiferromagnetic topological insulator with weak interlayer magnetic coupling

Chaowei Hu, Kyle N. Gordon, Pengfei Liu, Jinyu Liu, Xiaoqing Zhou, Peipei Hao, Dushyant Narayan, Eve Emmanouilidou, Hongyi Sun, Yuntian Liu, Harlan Brawer, Arthur P. Ramirez, Lei Ding, Huibo Cao, Qihang Liu (), Dan Dessau () and Ni Ni ()
Additional contact information
Chaowei Hu: University of California
Kyle N. Gordon: University of Colorado
Pengfei Liu: Southern University of Science and Technology
Jinyu Liu: University of California
Xiaoqing Zhou: University of Colorado
Peipei Hao: University of Colorado
Dushyant Narayan: University of Colorado
Eve Emmanouilidou: University of California
Hongyi Sun: Southern University of Science and Technology
Yuntian Liu: Southern University of Science and Technology
Harlan Brawer: University of California
Arthur P. Ramirez: University of California
Lei Ding: Oak Ridge National Laboratory
Huibo Cao: Oak Ridge National Laboratory
Qihang Liu: Southern University of Science and Technology
Dan Dessau: University of Colorado
Ni Ni: University of California

Nature Communications, 2020, vol. 11, issue 1, 1-8

Abstract: Abstract Magnetic topological insulators (TI) provide an important material platform to explore quantum phenomena such as quantized anomalous Hall effect and Majorana modes, etc. Their successful material realization is thus essential for our fundamental understanding and potential technical revolutions. By realizing a bulk van der Waals material MnBi4Te7 with alternating septuple [MnBi2Te4] and quintuple [Bi2Te3] layers, we show that it is ferromagnetic in plane but antiferromagnetic along the c axis with an out-of-plane saturation field of ~0.22 T at 2 K. Our angle-resolved photoemission spectroscopy measurements and first-principles calculations further demonstrate that MnBi4Te7 is a Z2 antiferromagnetic TI with two types of surface states associated with the [MnBi2Te4] or [Bi2Te3] termination, respectively. Additionally, its superlattice nature may make various heterostructures of [MnBi2Te4] and [Bi2Te3] layers possible by exfoliation. Therefore, the low saturation field and the superlattice nature of MnBi4Te7 make it an ideal system to investigate rich emergent phenomena.

Date: 2020
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DOI: 10.1038/s41467-019-13814-x

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