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VOLUME 71 (2000) | ISSUE 8 | PAGE 496
Phase diagram and skyrmion energy for bilayer heterostructures at integer filling factors
Phase diagram of a bilayer heterostructure at integer filling factors was established using the hidden symmetry method. Three phases: ferromagnetic, canted antiferromag-netic (CAP) and spin-singlet, have been found. We confirm early results of Das.Sarma et ai. Each phase violates the Sf/(4) hidden symmetry and is stabilized by anisotropy interactions. A charged excitation in bilayer: skyrmibn, has been found and its anisotropic energy gap has been calculated. The gap has a prominent minimum in the CAP.