Exploring Intrinsic Magnetic Topological Insulators: The Case of EuIn${}_2$As${}_2$

Abstract

In this study, ultrafast optical spectroscopy was employed to elucidate the intricate topological features of EuIn${}_2$As${}_2$, a promising candidate for a magnetic topological-crystalline axion insulator. Our investigation, focusing on the real-time evolution of topological states, unveiled a narrow surface magnetic gap (2${\Delta }_0$ $\simeq$ 8.2 meV)) emerging at the antiferromagnetic transition temperature ($T_N$ $\approx$ 16 K). Below $T_N$, two extremely low-energy collective modes, ${\omega }_1$ and ${\omega }_2$, with frequencies of $\sim$9.9 and 21.6 GHz at $T$ = 4 K, respectively, were observed, exhibiting strong temperature dependence. ${\omega }_1$ correlates with an acoustic phonon, while ${\omega }_2$ is associated with a magnon. The results suggest that EuIn${}_2$As${}_2$ has the potential to manifest a magnetic topological-crystalline axion insulator, presenting a small magnetic energy gap on the (001) surface. The findings further our understanding of the interplay between magnetism and topology in this material, showcasing its potential for applications in quantum information processing and spintronics.

arXiv comment6 pages, 4 figures

References in corpus (26)

• Topological Insulators
• Topological insulators and superconductors
• Electrodynamics of Correlated Electron Materials
• Progress and prospects in magnetic topological materials
• High-throughput calculations of magnetic topological materials
• Higher-order Topology of Axion Insulator EuIn${}_2$As${}_2$
• Quasiparticle relaxation dynamics in superconductors with different gap structures: theory and experiments on YBa_{2}Cu_{3}O_{7-δ}
• Dirac surface states in intrinsic magnetic topological insulators EuSn2As2 and MnBi2nTe3n+1
• Ultrafast carrier and phonon dynamics in Bi2Se3 crystals
• Controlling the anisotropy of a van der Waals antiferromagnet with light
• Single-particle and collective mode couplings associated with 1- and 2-directional electronic ordering in metallic RTe${}_3$ (R = Ho, Dy, Tb)
• Magnetic crystalline-symmetry-protected axion electrodynamics and field-tunable unpinned Dirac cones in EuIn2As2
• In-plane antiferromagnetic moments in axion topological insulator candidate EuIn${}_2$As${}_2$
• Temperature Dependent Electronic Structure in a Higher Order Topological Insulator Candidate EuIn${}_2$As${}_2$
• Signature of band inversion in the antiferromagnetic phase of axion insulator candidate EuIn2As2
• Measurement of Two Low-Temperature Energy Gaps in the Electronic Structure of Antiferromagnetic USb2 Using Ultrafast Optical Spectroscopy
• Hybridization dynamics in CeCoIn5 revealed by ultrafast optical spectroscopy
• Coupling Between An Optical Phonon and the Kondo Effect
• Ultrafast Optical Spectroscopy Evidence of Pseudogap and Electron-Phonon Coupling in an Iron-Based Superconductor KCa${}_2$Fe${}_4$As${}_4$F${}_2$
• Charge Density Wave order and electron-phonon coupling in ternary superconductor Bi${}_2$Rh${}_3$Se${}_2$
• Temperature evolution of quasiparticle dispersion dynamics in semimetallic 1T-TiTe2 via high-resolution angle-resolved photoemission spectroscopy and ultrafast optical pump-probe spectroscopy
• Van der Waals engineering of ultrafast carrier dynamics in magnetic heterostructures
• Infrared study of the interplay of charge, spin, and lattice excitations in the magnetic topological insulator EuIn${}_2$As${}_2$
• Surface state evolution induced by magnetic order in axion insulator candidate EuIn2As2
• Coupling of optical phonons with Kondo effect and magnetic orders in antiferromagnetic Kondo lattice CeAuSb${}_2$
• The Hidden Nematic Fluctuations in the Triclinic (Ca0.85La0.15)10(Pt3As8)(Fe2As2)5 Superconductor Revealed by Ultrafast Optical Spectroscopy

Cited by in corpus (3)

• Ultrafast photoinduced phase transition in the antiferromagnetic Dirac semimetal EuAgAs
• Research on topological materials using ultrafast spectroscopy
• Topological properties of domain walls in antiferromagnetic topological insulators