Excitonic charge-density-wave instability of spatially separated electron-hole layers in strong magnetic fields

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Abstract
We use the Hartree-Fock approximation to investigate the ground state of a system consisting of spatially separated electron and hole layers in strong magnetic fields. When the layer separation is larger than a critical value a novel excitonic-density-wave state is found to have a lower energy than either a homogeneous exciton fluid or a double charge-density-wave state. The order parameters of the state satisfy a sum rule similar to that of a charge-density-wave state in a two-dimensional electron system. A possible connection between the new state and a recent experimental result is discussed.