Dresden 2014 – wissenschaftliches Programm
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DY: Fachverband Dynamik und Statistische Physik
DY 40: Poster - Quantum Systems/ Stat. Phys./ Diffusive Process
DY 40.23: Poster
Donnerstag, 3. April 2014, 17:00–19:00, P3
Diffusion of nanorods on quasicrystalline substrates with phasonic drift — •Felix Rühle1, Michael Schmiedeberg2, and Holger Stark1 — 1Institut für Theoretische Physik, Technische Universität Berlin, D-10623 Berlin — 2Institut für Theoretische Physik II, Heinrich-Heine-Universität Düsseldorf, D-40225 Düsseldorf
In order to understand ordering and growth on quasicrystalline subtrates, experiments and theory have investigated colloidal ordering in a two-dimensional decagonal potential that is realizable by laser interference patterns [1,2]. In particular, spheres and rods show interesting phase behaviour and colloidal dynamics [2,3].
Phasons are hydrodynamic modes that occur in quasiperiodic crystals only and represent local rearrangements of atoms. In this contribution, we apply a phasonic drift with a constant drift velocity to the decagonal potential [4]. We place single nanorods of two different lengths in the potential and investigate their diffusive motion for different phasonic drift velocities. The results are obtained using kinetic Monte-Carlo simulations. We observe that single rods pass through a superdiffusive regime before reaching normal diffusion in the long-time limit. Depending on the length of the rods and the direction of the phasonic drift, they may align themselves with a preferential direction in real space.
[1] J. Mikhael et al., Nature, 454, 501 (2008).
[2] M. Schmiedeberg and H.Stark, PRL, 101, 218302 (2008).
[3] P. Kählitz, M. Schoen, and H. Stark, JCP, 137, 224705 (2012).
[4] J.A. Kromer et al., EPJE, 36, 25 (2013).