The study presents a theoretical investigation of altermagnetic order in 2D metallic systems, demonstrating giant nonrelativistic spin splitting through antiferro-orbital order. The robustness of the phase is confirmed with a robustness score of 0.85.
Key findings
Antiferro-orbital order induces giant nonrelativistic spin splitting of the electronic bands.
Maximum spin splitting of approximately 400 meV, exceeding typical exchange splittings in conventional ferromagnets.
Spin splitting exhibits d-wave symmetry with nodes along the kx = ±ky directions.
Robustness score of 0.85 with the orbital order parameter Δ0 = 0.63 ± 0.03 over 50 disorder realizations.
Predicted gate-tunable transverse spin conductivity with sin(2φ) angular dependence.
Limitations & open questions
Further experimental verification is needed to confirm the theoretical predictions.