Physics – Condensed Matter
Scientific paper
1995-11-15
Phys. Rev. B 53 (1996), p. 4591
Physics
Condensed Matter
To appear in Phys. Rev. B. 21 pages written in REVTEX + 9 postscript figures
Scientific paper
10.1103/PhysRevB.53.4591
We investigate the stability, the dynamical properties and melting of a two-dimensional (2D) Wigner crystal (WC) of classical Coulombic particles in a bi-layer structure. Compared to the single-layer WC, this system shows a rich phase diagram. Five different crystalline phases are stable; the energetically favoured structure can be tuned by changing either the inter-layer distance or the particle density. Phase boundaries consist of both continuous and discontinuous transitions. We calculated the phonon excitations of the system within the harmonic approximation and we evaluated the melting temperature of the bi-layer WC by use of a modified Lindemann criterion, appropriate to 2D systems. We minimized the harmonic free-energy of the system with respect to the lattice geometry at different values of temperature/inter-layer distance and we found no temperature-induced structural phase transition.
Goldoni Guido
Peeters François M.
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