Fig. 3: Dependence of coupling strength KPDTM of the periodic trembling motion on the spin-orbit coupling constant βyx.
From: Trembling motion of electrons driven by Larmor spin precession
The data points are obtained from a number of InGaAs devices where the AC current is probed along different crystal directions. The overall linear behavior is suggesting that SO coupling is decisive to the generation of the PDTM component of the AC current.
