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Molecular dynamics studies of electron-hole bilayers

We investigated the properties of strongly coupled classical electron-hole bilayers using a molecular dynamics simulation code based on the PPPM (particle-particle particle-mesh) algorithm and applying the transformation of the two layers into a single layer with modified interaction potentials. The calculations were carried out for layer separations d comparable to the Wigner-Seitz radius a. The analysis of the (intra- and interlayer) pair correlation functions g 11 (r) and g 12 (r) showed that at layer separations d/a ≥ 3 the layers are independent of each other. With decreasing d/a a strongly increasing peak of g 12 develops at r/a = 0, indicating the formation of electron-hole pairs (classical excitons). The intralayer correlation function g 11 is essentially independent of the layer separation for d/a ≥ 1, the interaction of particles between the two layers does not influence the long range order (observed at high r values) in the layers. At d/a < 1 the long range order is destroyed due to the fact that the interaction is due to the dipole field of the electron-hole pairs.