Existence of Dipole-Density-Wave (DDW) State in Electron-Hole Junction Systems

Abstract

Ground states are investigated of a two dimensional electron-hole system in a magnetic field where electrons and holes move on parallel planes which are spatially separated. Especially a crystalline state of dipoles or a dipole-density-wave (DDW) state is considered. Such states are found to be stabilized by a magnetic field, since it is shown that the field increases the effective mass of a dipole. A phase diagram in the plane of density and magnetic field is obtained.