Stability of spin dynamics in a driven non-Hermitian double well

We study the stability of spin dynamics for a spin-orbit (SO) coupled boson held in a driven non-Hermitian double-well potential. It is surprising to find that when the ratio of the Zeeman field strength to the driving frequency is even, the SO coupling strength can take any value, and suitable parameters can be found to stabilize the quantum spin dynamics of the system. However, when the ratio of the Zeeman field strength to the driving frequency is odd, the SO coupling strength can only take integer or half-integer values for the spin dynamics of the system to possibly be stable.