. However, these relativistic mechanisms rely on external magnetic fields and suffer from low spin-polarization rates and relativistic spin-to-charge conversion efficiencies characterized by spin-Hall angle.introduces a nonrelativistic and nonmagnetic approach that directly exploits the light-triggered high-density charge currents across interfaces.
The researchers utilized various metals for the thin film, finding platinum to be the most promising. They fabricated Pt/RuO thin film heterostructures and measured their terahertz amplitudes. The Ir-based system produced signals three-fold stronger, comparable to those generated by commercial terahertz sources based on nonlinear optical crystals and photoconductive switches.
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