Anomalous in-plane magneto-optical anisotropy of self-assembled quantum   dots
  We report on a complex nontrivial behavior of the optical anisotropy of quantum dots that is induced by a magnetic field in the plane of the sample. We find that the optical axis either rotates in the opposite direction to that of the magnetic field or remains fixed to a given crystalline direction. A theoretical analysis based on the exciton pseudospin Hamiltonian unambiguously demonstrates that these effects are induced by isotropic and anisotropic contributions to the heavy-hole Zeeman term, respectively. The latter is shown to be compensated by a built-in uniaxial anisotropy in a magnetic field B_c = 0.4 T, resulting in an optical response typical for symmetric quantum dots. 
T. Kiessling, A. V. Platonov, G. V. Astakhov, T. Slobodskyy, S.   Mahapatra, W. Ossau, G. Schmidt, K. Brunner, L. W. Molenkamp