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Antiferromagnetic topological insulator with selectively gapped Dirac cones

DOI: 10.1038/s41467-023-42782-6 DOI Help

Authors: A. Honma (Tohoku University) , D. Takane (Tohoku University) , S. Souma (Tohoku University) , K. Yamauchi (Osaka University) , Y. Wang (University of Cologne) , K. Nakayama (Tohoku University; Japan Science and Technology Agency (JST)) , K. Sugawara (Tohoku University) , M. Kitamura (High Energy Accelerator Research Organization (KEK); National Institutes for Quantum Science and Technology (QST)) , K. Horiba (National Institutes for Quantum Science and Technology (QST)) , H. Kumigashira (Tohoku University) , K. Tanaka (UVSOR Synchrotron Facility, Institute for Molecular Science (Japan)) , T. K. Kim (Diamond Light Source) , C. Cacho (Diamond Light Source) , T. Oguchi (Osaka University) , T. Takahashi (Tohoku University) , Yoichi Ando (University of Cologne) , T. Sato (Tohoku University)
Co-authored by industrial partner: No

Type: Journal Paper
Journal: Nature Communications , VOL 14

State: Published (Approved)
Published: November 2023

Open Access Open Access

Abstract: 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.

Diamond Keywords: Antiferromagnetism

Subject Areas: Materials, Physics

Instruments: I05-ARPES

Added On: 20/11/2023 09:21


Discipline Tags:

Quantum Materials Physics Hard condensed matter - structures Magnetism Materials Science

Technical Tags:

Spectroscopy Angle Resolved Photoemission Spectroscopy (ARPES)