Effect of the confinement on two-dimensional complex plasmas with the shear force

Langevin molecular dynamics simulations reveal the impact of confinement strength on the structure and dynamics of a two-dimensional complex plasma under constant shear force. Structural analysis via Voronoi diagrams and the local bond-order parameter |Ψ₆| shows that stronger confinement enhances hexagonal order and mitigates shear-induced disorder. Dynamical properties, determined by mean-square displacement (MSD) and the velocity autocorrelation function (VACF), indicate that the shear-induced superdiffusion weakens with increasing confinement strength. The entropy change (ΔS) shows that strong confinement (ω > 1) balances particle dynamics between shear and shear-free regions, thereby stabilizing the system. These findings highlight the interplay between confinement and shear force.