Efficient Spin-to-Charge Conversion via Altermagnetic Spin Splitting Effect in Antiferromagnet RuO 2

The relativistic spin Hall effect and inverse spin Hall effect enable the efficient generation and detection of spin current. Recently, a nonrelativistic altermagnetic spin splitting effect (ASSE) has been theoretically and experimentally reported to generate time-reversal-odd spin current with controllable spin polarization in antiferromagnet RuO_{2}. The inverse effect, electrical detection of spin current via ASSE, still remains elusive. Here we show the spin-to-charge conversion stemming from ASSE in RuO_{2} by the spin Seebeck effect measurements. Unconventionally, the spin Seebeck voltage can be detected even when the injected spin current is polarized along the directions of either the voltage channel…

• NN
  National Natural Science Foundation of China

  Awards: 52225106, 12241404
• NS
  Natural Science Foundation of Beijing Municipality

  Award: JQ20010
• BI
  Beijing Innovation Center for Future Chip
• NK
  National Key Research and Development Program of China

  Award: 2022YFA1402603