Observation of a giant band splitting in altermagnetic MnTe

By T. Osumi, S. Souma, T. Aoyama, K. Yamauchi, A. Honma, K. Nakayama, T. Takahashi, K. Ohgushi, T. Sato. Physical review B, 2023

257 citations recorded by the source corpus.

We performed angle-resolved photoemission spectroscopy (ARPES) on hexagonal MnTe, a candidate for an altermagnet with a high critical temperature (TN=307 K). By utilizing photon-energy-tunable ARPES in combination with first-principles calculations, we found that the band structure in the antiferromagnetic phase exhibits a strongly anisotropic band-splitting associated with the time-reversal-symmetry breaking, providing the first direct experimental evidence for the altermagnetic band-splitting. The magnitude of the splitting reaches 0.8 eV at non-high-symmetry momentum points, which is much larger than the spin-orbit gap of ~0.3 eV along the GK high-symmetry cut. The present result paves the pathway toward realizing exotic physical properties associated with the altermagnetic spin-splitting.

Subfields: Atomic and Molecular Physics, and Optics, Electronic, Optical and Magnetic Materials, Materials Chemistry

View Paper: https://www.semanticscholar.org/paper/1aa3d204fd6949e3ba9cedde667c83e145156970

Citations in the corpus

• A metallic room-temperature d-wave altermagnet (2024, unknown): “The magnetic susceptibilities with magnetic field H along the c axis ( H // c ) and in the ab plane ( H // ab ) exhibit almost linear temperature dependence between 100 and 300 K (Fig.”