Berlin 2008 – wissenschaftliches Programm

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DY: Fachverband Dynamik und Statistische Physik

DY 29: Poster II

DY 29.38: Poster

Donnerstag, 28. Februar 2008, 16:00–18:00, Poster C

Melting transitions in 2D model colloids in presence of a 1D periodic potential — •Florian Bürzle and Peter Nielaba — Physics Department, University of Konstanz, 78464 Konstanz, Germany

In our work, we investigate phase transitions in 2D model colloids in presence of a 1D external periodic potential using Monte Carlo simulation techniques in the NVT ensemble. Thereby we extend former computational studies [1]. In particular, we explore a hard disk system with commensurability ratio p = √3a/(2d) = 2, where d is the period of the external potential and a is the mean distance between the disks. In this case, theoretical considerations [2] suggest a novel ”locked smectic” phase between the well known locked floating solid and the modulated liquid. In our simulations this new phase, which has already been observed in an experimental study [3], was verified. Furthermore, by definition of appropriate order parameters, we were able to obtain a phase diagram [4] based on the cumulant intersection method.
W. Strepp, S. Sengupta, P. Nielaba, Phys. Rev. E 63, 046106 (2001)
L. Radzihovsky, et al., Phys. Rev. E 63, 031503 (2001)
J. Baumgartl, et al., Phys. Rev. Lett. 93, 168301 (2004)
F. Bürzle and P. Nielaba, Phys. Rev. E 76, 051112 (2007)