MIXED-SPIN INCOMPRESSIBLE STATES IN THE FRACTIONAL QUANTUM HALL-EFFECT

This work provides a theory of the general structure of mixed-spin fra ctional quantum Hall states, which are relevant at low magnetic fields . This, in particular, leads to a microscopic description of the exper imentally observed mixed-spin states at nu = 2/3, 4/3, and 3/5. Antipa rallel-flux-attachment transformation of the composite fermion theory plays an important role in explaining the mixed-spin states in the fil ling factor range 3/2 > nu > 1/2.