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  • Title: Vortexlike topological defects in nematic colloids: chiral colloidal dimers and 2D crystals.
    Author: Tkalec U, Ravnik M, Zumer S, Musevic I.
    Journal: Phys Rev Lett; 2009 Sep 18; 103(12):127801. PubMed ID: 19792458.
    Abstract:
    We show that chiral ordering of the underlying complex fluid strongly influences defect formation and colloidal interactions. Nonsingular defect loops with a topological charge -2 are observed, with a cross section identical to hyperbolic vortices in magnetic systems. These loops are binding spontaneously formed pairs of colloidal particles and dimers, which are chiral objects. Chiral dimer-dimer interaction weakly depends on the chirality of dimers and leads to the assembly of 2D nematic colloidal crystals of pure or "mixed" chirality, intercalated with a lattice of nonsingular vortexlike defects.
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