Browsing by Subject "Particle densities"
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Item Open Access Density functional theory investigation of two-dimensional dipolar fermions in a harmonic trap(IOP, 2014) Üstünel, H.; Abedinpour, S. H.; Tanatar, BilalWe investigate the behavior of polarized dipolar fermions in a two-dimensional harmonic trap in the framework of the density functional theory (DFT) formalism using the local density approximation. We treat only a few particles interacting moderately. Important results were deduced concerning key characteristics of the system such as total energy and particle density. Our results indicate that, at variance with Coulombic systems, the exchange- correlation component was found to provide a large contribution to the total energy for a large range of interaction strengths and particle numbers. In addition, the density profiles of the dipoles are shown to display important features around the origin that is not possible to capture by earlier, simpler treatments of such systems.Item Open Access Formation, compression and surface melting of colloidal clusters by active particles(Royal Society of Chemistry, 2015) Kümmel, F.; Shabestari, P.; Lozano, C.; Volpe, G.; Bechinger, C.We demonstrate with experiments and numerical simulations that the structure and dynamics of a suspension of passive particles is strongly altered by adding a very small (<1%) number of active particles. With increasing passive particle density, we observe first the formation of dynamic clusters comprised of passive particles being surrounded by active particles, then the merging and compression of these clusters, and eventually the local melting of crystalline regions by enclosed active particles.