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27 April 2024

» arxiv » cond-mat/0601270

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Anomalous in-plane magneto-optical anisotropy of self-assembled quantum dots
T. Kiessling ; A. V. Platonov ; G. V. Astakhov ; T. Slobodskyy ; S. Mahapatra ; W. Ossau ; G. Schmidt ; K. Brunner ; L. W. Molenkamp ;
Date:	12 Jan 2006
Subject:	Materials Science
Abstract:	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.
Source:	arXiv, cond-mat/0601270
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