Classical double-layer atoms: artificial molecules

Details Classical double-layer atoms: artificial molecules Classical double-layer atoms: artificial molecules

1997-09-05

arxiv.org/abs/cond-mat/9709076v1

Physics

Condensed Matter

4 pages, RevTex, 5 ps figures, to appear in Phys.Rev.Lett

Scientific paper

10.1103/PhysRevLett.79.3990

The groundstate configuration and the eigenmodes of two parallel two-dimensional classical atoms are obtained as function of the inter-atomic distance (d). The classical particles are confined by identical harmonic wells and repel each other through a Coulomb potential. As function of d we find several structural transitions which are of first or second order. For first (second) order transitions the first (second) derivative of the energy with respect to d is discontinuous, the radial position of the particles changes discontinuously (continuously) and the frequency of the eigenmodes exhibit a jump (one mode becomes soft, i.e. its frequency becomes zero).

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