Photodetachment dynamics of negative ion confined in a time-dependent quantum well

We investigate the photodetachment dynamics of negative ion confined in a time-dependent trap created by a quantum well with an oscillating wall for the first time. Compared with the photodetachment of negative ion in a quantum well with static walls, the movement of the detached electron becomes substantially complicated and interesting as one wall in the quantum well oscillates with time. The position–time plot of the detached electron in the quantum well shows a fractal structure of asymptotic self-similarity due to the influence of the oscillating wall. The returning kinetic energy of the detached electron may have been accelerated to high energy by colliding with the oscillating wall. By calculating the photodetachment cross section of this system, we find that the oscillating wall in the quantum well functions as an external driving potential for the photodetachment of negative ion. The photodetachment cross section becomes increasingly complicated due to the influence of the oscillating wall. In addition, the amplitude, initial phase, and the initial position of the oscillating wall all affect the photodetachment cross section of this system. Our study may guide future experimental investigations on the photodetachment dynamics in the ion trap.