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

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.

Authors:
ORCiD logo [1];  [2];  [3];  [3]; ORCiD logo [2];  [2];  [2];  [1];  [3];  [3];  [1];  [4]; ORCiD logo [5]; ORCiD logo [5];  [3]; ORCiD logo [2]; ORCiD logo [1]
  1. Univ. of California, Los Angeles, CA (United States)
  2. Univ. of Colorado, Boulder, CO (United States)
  3. Southern Univ. of Science and Technology, Shenzhen (China)
  4. Univ. of California, Santa Cruz, CA (United States)
  5. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Publication Date:
Research Org.:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
OSTI Identifier:
1606670
Grant/Contract Number:  
AC05-00OR22725
Resource Type:
Accepted Manuscript
Journal Name:
Nature Communications
Additional Journal Information:
Journal Volume: 11; Journal Issue: 1; Journal ID: ISSN 2041-1723
Publisher:
Nature Publishing Group
Country of Publication:
United States
Language:
English
Subject:
71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS

Citation Formats

Hu, Chaowei, Gordon, Kyle, Liu, Pengfei, Liu, Jinyu, Zhou, Xiaoqing, Hao, Peipei, Narayan, Dushyant, Emmanouilidou, Eve, Sun, Hongyi, Liu, Yuntian, Brawer, Harlan, Ramirez, Arthur, Ding, Lei, Cao, Huibo, Liu, Qihang, Dessau, Dan, and Ni, Ni. A van der Waals antiferromagnetic topological insulator with weak interlayer magnetic coupling. United States: N. p., 2020. Web. https://doi.org/10.1038/s41467-019-13814-x.
Hu, Chaowei, Gordon, Kyle, Liu, Pengfei, Liu, Jinyu, Zhou, Xiaoqing, Hao, Peipei, Narayan, Dushyant, Emmanouilidou, Eve, Sun, Hongyi, Liu, Yuntian, Brawer, Harlan, Ramirez, Arthur, Ding, Lei, Cao, Huibo, Liu, Qihang, Dessau, Dan, & Ni, Ni. A van der Waals antiferromagnetic topological insulator with weak interlayer magnetic coupling. United States. https://doi.org/10.1038/s41467-019-13814-x
Hu, Chaowei, Gordon, Kyle, Liu, Pengfei, Liu, Jinyu, Zhou, Xiaoqing, Hao, Peipei, Narayan, Dushyant, Emmanouilidou, Eve, Sun, Hongyi, Liu, Yuntian, Brawer, Harlan, Ramirez, Arthur, Ding, Lei, Cao, Huibo, Liu, Qihang, Dessau, Dan, and Ni, Ni. Tue . "A van der Waals antiferromagnetic topological insulator with weak interlayer magnetic coupling". United States. https://doi.org/10.1038/s41467-019-13814-x. https://www.osti.gov/servlets/purl/1606670.
@article{osti_1606670,
title = {A van der Waals antiferromagnetic topological insulator with weak interlayer magnetic coupling},
author = {Hu, Chaowei and Gordon, Kyle and Liu, Pengfei and Liu, Jinyu and Zhou, Xiaoqing and Hao, Peipei and Narayan, Dushyant and Emmanouilidou, Eve and Sun, Hongyi and Liu, Yuntian and Brawer, Harlan and Ramirez, Arthur and Ding, Lei and Cao, Huibo and Liu, Qihang and Dessau, Dan and Ni, Ni},
abstractNote = {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.},
doi = {10.1038/s41467-019-13814-x},
journal = {Nature Communications},
number = 1,
volume = 11,
place = {United States},
year = {2020},
month = {1}
}

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    Works referencing / citing this record:

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