Author： Assoud L. Messina R. Löwen H.
Publisher： Edp Sciences
E-ISSN： 1286-4854|89|3|36001-36001
ISSN： 0295-5075
Source： EPL (EUROPHYSICS LETTERS), Vol.89, Iss.3, 2010-02, pp. : 36001-36001
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Abstract
The ground state of a two-dimensional ionic mixture at zero pressure composed of oppositely charged spheres is determined as a function of the size asymmetry by using a penalty method. The cascade of stable structures includes square, triangular and rhombic crystals as well as “empty” crystals made up of dipoles and chains, which have a vanishing number density. Thereby we confirm the square structure, found experimentally on charged granulates, and predict new phases detectable in experiments on granular and colloidal matter.
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