Molecular-dynamics studies of charge complexes in liquid helium

摘要

Molecular-dynamics simulations were employed to describe the solid-liquid phase transition of charge complexes in helium films. These two-dimensional atomic-like states, called diplons, arise from the coupling between surface electrons on helium film and positive ions localized in the helium film-substrate interface. The effects of the distance between the helium film and the substrate on the structural properties of the diplon system are investigated. The melting temperature was determined by analyzing quantities like the total energy per particle, the self-diffusion coefficient, and the pair correlation function.