Nearly Complete Charge--Spin Conversion via Strain-Eliminated Fermi Pockets in a -Wave Altermagnet
This study demonstrates that applying in-plane equibiaxial tensile strain to the room-temperature altermagnet KVSeO eliminates parasitic Fermi pockets, thereby restoring flat-band geometry and achieving a record charge-to-spin conversion efficiency of approximately 96%, which establishes strain engineering as a practical route for high-efficiency spintronic devices.