1211.6720 (Benjamin M. Fregoso et al.)

Wigner Crystallization in Electron-Hole Double Layers: Evolution from
Long- to Short-Range Forces    [PDF]

Benjamin M. Fregoso, C. A. R. Sá de Melo

We study fermions in two dimensions interacting via a long range 1/r potential for small particle separations and a short range 1/r^3 potential for larger separations on length scales \xi. We computed the energy of the Wigner crystal and a homogeneous Fermi liquid phases in a variational approach and determined the phase diagram as a function of density and \xi at zero temperature. We discuss the collective modes in the FL phase, finite temperature effects on the phase diagram, and possible experimental realizations of this model.

View original: http://arxiv.org/abs/1211.6720