Anomalous in-plane magneto-optical anisotropy of self-assembled quantum dots

Details Anomalous in-plane magneto-optical anisotropy of self-assembled quantum dots Anomalous in-plane magneto-optical anisotropy of self-assembled quantum dots

2006-01-12

arxiv.org/abs/cond-mat/0601270v1

Phys. Rev. B 74, 041301(R) (2006)

Physics

Condensed Matter

Materials Science

5 pages, 3 figures

Scientific paper

10.1103/PhysRevB.74.041301

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.

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