Anomalous in-plane magneto-optical anisotropy of self-assembled quantum dots
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 BC=0.4T , resulting in an optical response typical for symmetric quantum dots.
- Publication:
-
Physical Review B
- Pub Date:
- July 2006
- DOI:
- 10.1103/PhysRevB.74.041301
- arXiv:
- arXiv:cond-mat/0601270
- Bibcode:
- 2006PhRvB..74d1301K
- Keywords:
-
- 78.67.Hc;
- 71.70.-d;
- 78.55.Et;
- Quantum dots;
- Level splitting and interactions;
- II-VI semiconductors;
- Condensed Matter - Materials Science
- E-Print:
- 5 pages, 3 figures