Spatio-temporal correlations in Coulomb clusters
1 Indian Institute of Science Education and Research - Kolkata, Mohanpur-741246, India
2 S.N. Bose National Centre for Basic Sciences - Block-JD, Sector-III, Salt Lake, Kolkata-700098, India
Received: 25 February 2016
Accepted: 13 May 2016
The dynamical responses of Coulomb-interacting particles in two-dimensional nanoclusters are analyzed at different temperatures characterizing their solid- and liquid-like behavior. Depending on the trap symmetry, spatial correlations undergo slow, stretched exponential relaxations at long times, arising from spatially correlated motion in string-like paths. Such results stem from the combined effects of confinement and long-range repulsion, making the systems inherently heterogeneous. While particles in a “solid” flow produce dynamic heterogeneities, motion in “liquid” yields an unusually long tail in the distribution of particle displacements. A phenomenological model captures much of the subtleties of our numerical simulations.
PACS: 64.60.an – Finite-size systems / 61.20.Lc – Time-dependent properties; relaxation / 64.70.D- – Solid-liquid transitions
© EPLA, 2016