Temperature Dependence of Relativistic Valence Band Splitting Induced by an Altermagnetic Phase Transition

Abstract

Altermagnetic (AM) materials exhibit non-relativistic, momentum-dependent spin-split states, ushering in new opportunities for spin electronic devices. While the characteristics of spin-splitting have been documented within the framework of the non-relativistic spin group symmetry, there has been limited exploration of the inclusion of relativistic symmetry and its impact on the emergence of a novel spin-splitting in the band structure. This study delves into the intricate relativistic electronic structure of an AM material, alpha-MnTe. Employing temperature-dependent angle-resolved photoelectron spectroscopy across the AM phase transition, we elucidate the emergence of a relativistic valence band splitting concurrent with the establishment of magnetic order. This discovery is validated through disordered local moment calculations, modeling the influence of magnetic order on the electronic structure and confirming the magnetic origin of the observed splitting. The temperature-dependent splitting is ascribed to the advent of relativistic spin-splitting resulting from the strengthening of AM order in alpha-MnTe as the temperature decreases. This sheds light on a previously unexplored facet of this intriguing material.

References in corpus (8)

• Efficient Electrical Spin-Splitter Based on Non-Relativistic Collinear Antiferromagnetism
• Broken Kramers' degeneracy in altermagnetic MnTe
• Direct observation of altermagnetic band splitting in CrSb thin films
• Spontaneous anomalous Hall effect arising from an unconventional compensated magnetic phase in a semiconductor
• Prediction of unconventional magnetism in doped FeSb2
• Observation of Giant Band Splitting in Altermagnetic MnTe
• Sensitivity of the MnTe valence band to orientation of magnetic moments
• Femtosecond phononic coupling to both spins and charges in a room temperature antiferromagnetic semiconductor

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• Spin-Polarized Antiferromagnetic Spintronics
• Third-order and fifth-order nonlinear spin-current generation in $g$-wave and $i$-wave altermagnets, and perfectly nonreciprocal spin-current in $f$-wave magnets
• Interplay of altermagnetism and pressure in hexagonal and orthorhombic MnTe
• Field-sensitive dislocation bound states in two-dimensional $d$-wave altermagnets
• Electric field-induced nonreciprocal directional dichroism in a time-reversal-odd antiferromagnet
• Light-induced odd-parity altermagnets on dimerized lattices
• Quantum geometry and $X$-wave magnets with $X=p,d,f,g,i$
• Revisiting the symmetry and optical phonons of altermagnetic $\alpha$-MnTe
• Magnetization symmetry for the MnTe altermagnetic candidate
• Altermagnetism, ARPES, symmetry, non-relativistic band splitting
• Unlocking Doping Effects on Altermagnetism in MnTe: Emergence of Quasi-altermagnetism
• Zeeman-type spin splittings in strained d-wave altermagnets
• Electrical Control of the Exchange Bias Effect at Model Ferromagnet-Altermagnet Junctions
• Josephson diode and spin-valve effects on the surface of altermagnet CrSb
• Cartesian Nodal Lines and Magnetic Kramers Weyl Nodes in Spin-Split Antiferromagnets