Dresden 2009 – wissenschaftliches Programm

Bereiche | Tage | Auswahl | Suche | Downloads | Hilfe

DY: Fachverband Dynamik und Statistische Physik

DY 5: Soft matter

DY 5.5: Vortrag

Montag, 23. März 2009, 15:45–16:00, ZEU 255

Phase behavior of a dipolar monolayer: An integral equation study — •Liang Luo^1,2 and Sabine H. L. Klapp¹ — ¹Institut für Theoretische Physik, Arnimallee 14, Freie Universität Berlin, D-14195 Berlin, Germany — ²Institute of Theoretical Physics, Chinese Academy of Science, Beijing 100080, China

Using integral equation theory in the Reference Hypernetted Chain (RHNC) approximation we investigate the structure and phase behavior of a dipolar hard sphere (DHS) monolayer. The dipole orientations of the particles are confined to the plane, reflecting the strong tendency of three-dimensional dipoles to orient along in-plane directions. The phase behavior is studied with an instability analysis for a wide range of densities. In agreement with simulation results, we find that the cluster- and chain-formation dominates the low density region around the spinodal temperature. With the density increasing, we observe larger contact numbers, signalling longer average chain lengths and more complicated structures such as crossing chains. In the high density region, there is no obvious indication for ferroelectric long-range correlations, contrary to the behavior of three-dimensional dipolar fluids. The instability analysis rather indicates crystallization at these high densities.