Europhys. Lett.
Volume 72, Number 3, November 2005
Page(s) 396 - 402
Section Physics of gases, plasmas and electric discharges
Published online 30 September 2005
Europhys. Lett., 72 (3), pp. 396-402 (2005)
DOI: 10.1209/epl/i2004-10551-4

Structure and phase diagram of strongly-coupled bipolar charged-particle bilayers

P. Hartmann1, Z. Donkó1 and G. J. Kalman2

1  Research Institute for Solid State Physics and Optics of the Hungarian Academy of Sciences - P.O. Box 49, H-1525 Budapest, Hungary
2  Department of Physics, Boston College - Chestnut Hill, MA 02467, USA

received 5 October 2004; accepted in final form 8 September 2005
published online 30 September 2005

We report Monte Carlo simulations of a classical, strongly-coupled charged-particle bilayer with opposite charges in the two layers. At layer separations comparable to the Wigner-Seitz radius the two layers support each other to establish a quasi-long-range order; at low layer separations stable dipoles (classical equivalents of bound excitons) are formed and the long-range order is extinguished as the Coulomb interaction changes to a dipole-dipole interaction. We identify dipole-liquid, dipole-solid, Coulomb-liquid and Coulomb-solid phases, which are exhibited in an intuitive phase diagram of the system in the $\Gamma$ (coupling)-d (layer separation) plane.

52.27.Gr - Strongly-coupled plasmas.
68.65.Ac - Multilayers.
05.20.-y - Classical statistical mechanics.

© EDP Sciences 2005