Ground-state properties of charged bosons confined in a one-dimensional harmonic double-well trap: diffusion Monte Carlo calculations

The diffusion Monte Carlo method is applied to study the groud-state propertied of charged bosons in on dimension confined in a harmonic double-well trap. The particles interact repulsively a Coulombic 1/r potential. Numerical results show that the well seperation has significan influence on the ground-state propertied of the system. When the interaction of the system is weak, ground-state energy decreases with the increasing well seperation and has a minimal value. If the well seperation increase continually, the ground-state energy increase and approaches to a constant gradually. This effect will be abatable in the strong interacting system. In addition, by calculating the density of the systems for differen interaction strengths with various well seperations, we find that the density increases abnormally when the well seperation is large at the centre of the system.