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Issue 7, 2008
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Ground states of colloidal molecular crystals on periodic substrates

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Abstract

Two-dimensional suspensions of spherical colloids subject to periodic external fields exhibit a rich variety of molecular crystalline phases. We study in simulations the ground state configurations of dimeric and trimeric systems, that are realized on square and triangular lattices, when either two or three macroions are trapped in each external potential minimum. Bipartite orders of the checkerboard or stripe types are reported together with more complex quadripartite orderings, and the shortcomings of envisioning the colloids gathered in a single potential minimum as a composite rigid object are discussed. This work also sheds light on simplifying assumptions underlying previous theoretical treatments and that made possible the mapping onto spin models.

Graphical abstract: Ground states of colloidal molecular crystals on periodic substrates

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Publication details

The article was received on 01 Feb 2008, accepted on 13 Mar 2008 and first published on 07 May 2008


Article type: Paper
DOI: 10.1039/B801907J
Citation: Soft Matter, 2008,4, 1491-1498
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    Ground states of colloidal molecular crystals on periodic substrates

    S. El Shawish, J. Dobnikar and E. Trizac, Soft Matter, 2008, 4, 1491
    DOI: 10.1039/B801907J

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