Magnetic and Crystal Symmetry Effects on Spin Hall Conductivity in Altermagnets
The study investigates how magnetic and crystal symmetries control unconventional spin Hall conductivity (USHC) in altermagnets like RuO2, CrSb, and MnTe using first-principles calculations. It found that while RuO2 shows trivial USHC unless tilted, CrSb and MnTe exhibit robust USHC driven by genuine magnetic symmetry breaking. This provides a theoretical basis for engineering spin-based functionalities.