Fig. 6: THz emission via inverse spin–orbit torque effect.
From: Ultrafast terahertz emission from emerging symmetry-broken materials
a Schematic of spin-orbit torques that can result from effective magnetic fields driven by an ultrafast pump pulse. b Pump helicity dependence of THz emission via ISOTE, where different circular polarization states give rise to different orientations of optically-induced effective magnetic fields and THz pulse phase reversal. c THz transient from a Co/Pt heterostructure showing phase reversal under interchange of pump helicity, sample, magnetization, and layer order. Panel (c) adapted with permission from ref. 137 © 2016 Nature Publishing Group
