CONDENSATION OF 2D ELECTRON-HOLE PAIRS WITH SPIN DEGREE-OF-FREEDOM

We study theoretically a condensate of electron-hole pairs with differ ent spin orientations. In a mean field description, both the energy an d the chemical potentials of this system depend strongly on both the s pin polarization and total density. The phase coherence induced by con densation of pairs is discussed. When electrons and holes are located in two separated planes, the system can be either totally spin polariz ed for a large separation or spin unpolarized for a small separation. (C) 1998 Elsevier Science B.V. All rights reserved.