Spin structures in inhomogeneous fractional quantum Hall systems

Formation of domains in highly correlated fractional quantum Hall states is the anticipated explanation of the huge longitudinal magnetoresistance (HLM) phenomenon. Nuclear spins are expected to be responsible for disturbing the homogeneous ground states. We use a finite size model employing exact diagonalization to see how the fractional quantum Hall states respond to magnetic impurities. Results indicate that domains cannot build up when only the incompressible states are involved.