| Issue |
EPL
Volume 89, Number 3, February 2010
|
|
|---|---|---|
| Article Number | 36001 | |
| Number of page(s) | 5 | |
| Section | Condensed Matter: Structural, Mechanical and Thermal Properties | |
| DOI | https://doi.org/10.1209/0295-5075/89/36001 | |
| Published online | 16 February 2010 | |
Ionic mixtures in two dimensions: From regular to empty crystals
Institut für Theoretische Physik II: Weiche Materie, Heinrich-Heine-Universität Düsseldorf Universitätsstrasse 1, D-40225 Düsseldorf, Germany, EU
Received:
12
November
2009
Accepted:
11
January
2010
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.
PACS: 64.70.kp – Ionic crystals / 61.50.Ah – Theory of crystal structure, crystal symmetry; calculations and modeling / 82.70.Dd – Colloids
© EPLA, 2010
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