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Signature of band inversion in the antiferromagnetic phase of axion insulator candidate EuIn2As2

DOI: 10.1103/PhysRevResearch.2.033342 DOI Help

Authors: Takafumi Sato (Tohoku University) , Zhiwei Wang (Beijing Institute of Technology) , Daichi Takane (Tohoku University) , Seigo Souma (Tohoku University) , Chaoxi Cui (Beijing Institute of Technology) , Yongkai Li (Beijing Institute of Technology) , Kosuke Nakayama (Tohoku University; Precursory Research for Embryonic Science and Technology (PRESTO), Japan Science and Technology Agency (JST)) , Tappei Kawakami (Tohoku University) , Yuya Kubota (Tohoku University) , Cephise Cacho (Diamond Light Source) , Timur Kim (Diamond Light Source) , Arian Arab (Swiss Light Source) , Vladimir N. Strocov (Swiss Light Source) , Yugui Yao (Beijing Institute of Technology) , Takashi Takahashi (Tohoku University)
Co-authored by industrial partner: No

Type: Journal Paper
Journal: Physical Review Research , VOL 2

State: Published (Approved)
Published: September 2020
Diamond Proposal Number(s): 23799

Open Access Open Access

Abstract: We have performed angle-resolved photoemission spectroscopy on EuIn 2 As 2 which is predicted to be an axion insulator in the antiferromagnetic state. By utilizing soft-x-ray and vacuum-ultraviolet photons, we revealed a three-dimensional hole pocket centered at the Γ point of the bulk Brillouin zone together with a heavily hole-doped surface state in the paramagnetic phase. Upon entering the antiferromagnetic phase, the band structure exhibits a marked reconstruction characterized by the emergence of an “M”-shaped bulk band near the Fermi level. The qualitative agreement with first-principles band-structure calculations suggests the occurrence of bulk-band inversion at the Γ point in the antiferromagnetic phase. We suggest that EuIn 2 As 2 provides a good opportunity to study the exotic quantum phases associated with a possible axion-insulator phase.

Journal Keywords: Fermi surface; Surface states; Topological insulators

Diamond Keywords: Antiferromagnetism

Subject Areas: Physics, Materials

Instruments: I05-ARPES

Other Facilities: ADRESS beamline at Swiss Light Source

Added On: 07/09/2020 13:50


Discipline Tags:

Materials Science Quantum Materials Physics Hard condensed matter - electronic properties Magnetism Surfaces

Technical Tags:

Spectroscopy Angle Resolved Photoemission Spectroscopy (ARPES) High Resolution ARPES (HR-ARPES)