Wigner crystallization in quantum electron bilayers
Istituto Nazionale di Fisica della Materia and Dipartimento di Fisica, Università di Modena - Via Campi
213/A, I-41100 Modena, Italy
2 Departement Natuurkunde, Universiteit Antwerpen (UIA), Universiteitsplein 1, B-2610 Antwerpen, Belgium
Accepted: 17 December 1996
The phase diagram of quantum electron bilayers in zero magnetic field is obtained using density functional theory. For large electron densities the system is in the liquid phase, while for smaller densities the liquid may freeze (Wigner crystallization) into four different crystalline phases; the lattice symmetry and the critical density depend on the interlayer distance. The phase boundaries between different Wigner crystals consist of both first- and second-order transitions, depending on the phases involved, and join the freezing curve at three different triple points.
PACS: 73.20.Dx – Electron states in low-dimensional structures (superlattices, quantum well structures and multilayers) / 64.70.Dv – Solid-liquid transitions / 64.70.Kb – Solid-solid transitions
© EDP Sciences, 1997