Photodetachment of hydrogen anion inside a square torus microcavity

摘要

The photodetachment of hydrogen anion inside a microcavity in the shape of a concentric square torus is studied for the first time. Compared to the photodetachment of hydrogen anion inside a square microcavity, the classical motion of the detached electron becomes much more complex and chaos appears. We thoroughly find out the closed orbit of the detached electron and calculate the photodetachment cross section of this system. It is shown that oscillatory structure appears in the photodetachment cross section, which is caused by the quantum interference effects of the returning electron waves traveling along the closed orbits with the outgoing waves. In order to explore the quantum and classical correspondence in the square torus microcavity, we calculate the Fourier-transformed photodetachment cross section and find each peak in the Fourier-transformed cross section corresponds to the length of one detached electron's closed orbit. As a demonstration, the case for a concentric square torus with the side ratio of the inner and outer square equals to 0.5 is calculated and analyzed in detail. We hope that our results will be useful in understanding the photodetachment of anions or electron transport in a microcavity.