In a recent study published by Physical Review Letters, researchers in Argonne’s Materials Science division and at the Center for Nanoscale Materials, a U.S. Department of Energy Office of Science User Facility, demonstrate that interfacial spin-orbit coupling and ultrafast spin-charge current transfer can generate THz radiation.
Demonstration that interfacial spin-orbit coupling and ultrafast spin-charge current transfer can generate THz radiation.
Significance and impact
Interfacial spin-orbit coupling may lead to spintronics devices and new methods to study ultrafast spin-coupled ultrafast processes at interfaces.
- Ultrafast spin currents generated via optical excitation get converted into charge current pulses via interfacial spin-orbit coupling on ps time scales
- The observation is consistent with expectations from Rashba spin-orbit coupling
- Circular polarization of the incoming light results in a helicity-dependent rotation of the THz field
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