Antiferromagnetic topological insulator with selectively gapped Dirac cones

被引：0
作者：
A. Honma
D. Takane
S. Souma
K. Yamauchi
Y. Wang
K. Nakayama
K. Sugawara
M. Kitamura
K. Horiba
H. Kumigashira
K. Tanaka
T. K. Kim
C. Cacho
T. Oguchi
T. Takahashi
Yoichi Ando
T. Sato
机构：
[1] Tohoku University,Department of Physics, Graduate School of Science
[2] Tohoku University,Center for Science and Innovation in Spintronics (CSIS)
[3] Tohoku University,Advanced Institute for Materials Research (WPI
[4] Osaka University,AIMR)
[5] Institute of Physics II,Center for Spintronics Research Network (CSRN)
[6] University of Cologne,Institute of Multidisciplinary Research for Advanced Materials (IMRAM)
[7] Precursory Research for Embryonic Science and Technology (PRESTO),International Center for Synchrotron Radiation Innov1ation Smart (SRIS)
[8] Japan Science and Technology Agency (JST),undefined
[9] Institute of Materials Structure Science,undefined
[10] High Energy Accelerator Research Organization (KEK),undefined
[11] National Institutes for Quantum Science and Technology (QST),undefined
[12] Tohoku University,undefined
[13] UVSOR Synchrotron Facility,undefined
[14] Institute for Molecular Science,undefined
[15] Diamond Light Source,undefined
[16] Harwell Science and Innovation Campus,undefined
[17] Tohoku University,undefined
来源：
Nature Communications | / 14卷
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摘要：
Antiferromagnetic (AF) topological materials offer a fertile ground to explore a variety of quantum phenomena such as axion magnetoelectric dynamics and chiral Majorana fermions. To realize such intriguing states, it is essential to establish a direct link between electronic states and topology in the AF phase, whereas this has been challenging because of the lack of a suitable materials platform. Here we report the experimental realization of the AF topological-insulator phase in NdBi. By using micro-focused angle-resolved photoemission spectroscopy, we discovered contrasting surface electronic states for two types of AF domains; the surface having the out-of-plane component in the AF-ordering vector displays Dirac-cone states with a gigantic energy gap, whereas the surface parallel to the AF-ordering vector hosts gapless Dirac states despite the time-reversal-symmetry breaking. The present results establish an essential role of combined symmetry to protect massless Dirac fermions under the presence of AF order and widen opportunities to realize exotic phenomena utilizing AF topological materials.
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