Dresden 2017 – wissenschaftliches Programm

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DY: Fachverband Dynamik und Statistische Physik

DY 44: Statistical Physics (general)

DY 44.5: Vortrag

Donnerstag, 23. März 2017, 11:00–11:15, ZEU 147

On the influence of interaction softness on crystallization of soft particles in 2D: A systematic DFT study — •Alexander Kraft and Sabine H. L. Klapp — Institut für Theoretische Physik, Technische Universität Berlin, Hardenbergstraße 36, 10623 Berlin

We investigate a system of soft particles with varying steepness of the interaction potential in a 2D system within the framework of density functional theory (DFT) and dynamical density functional theory (DDFT). Depending on system parameters, we find a homogeneous fluid phase or crystallization. In contrast to previous studies on 3D systems [1,2], here we focus on a 2D system in order to gain access to the behaviour in flat geometries or on surfaces, which was started in Ref. [3,4]. Furthermore, we systematically study the influence of the steepness of the interaction potential. We compare calculations based on free minimization within DFT with estimates based on linear stability analysis of the fluid state, which yields good agreements for all steepness values. Furthermore, we investigate the crystal-liquid coexistence and discuss possible control strategies by external potentials or prestructured substrates on crystallization.

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• [2] A. J. Archer and R. Evans, Phys. Rev. E 64 (2001)
• [3] S. Prestipino and F. Saija, J. Chem. Phys. 141, 184502 (2014)
• [4] A. J. Archer and A. Malijevský, J. Phys.: Condens. Matter 28, 244017 (2016)