Fig. 3: Relationship between THz signal and Néel vector n.
From: Terahertz oscillation driven by optical spin-orbit torque
a, b Schematic of ferroelastic strain switching of UMA driven by electric fields in Mn2Au/PMN-PT (011) structure. Néel moments are switched towards the compressive direction of the PMN-PT substrate, [0\(\bar{1}\)1] and [100] axes in (a) and (b), respectively. The inset of (a) shows a representation of the P–E loop, where P, E+ and E− represent the electric polarization, positive electric field (larger than the ferroelectric coercive field) and negative electric field (coercive field), respectively. The radiated THz emission signals in PMN-PT/Mn2Au structures with electric field E+ and opposite circularly polarized laser with ETHz,x (c) and ETHz,y (d). The radiated ETHz,x (e) and ETHz,y (f) signals from PMN-PT/Mn2Au structures with opposite circularly polarized lasers after electric field E− is applied.
