Phys. Rev. B 77, 153303 (2008) [4 pages]Anisotropic optical emission of single CdSe/CdS tetrapod heterostructures: Evidence for a wavefunction symmetry breakingReceived 6 March 2008; published 15 April 2008 Semiconductor tetrapods are expected to exhibit isotropic optical properties due to their tetrahedral symmetry. We have investigated the optical polarization properties of individual CdSe∕CdS tetrapods of high structural quality. In contrast to the light absorption behavior, a pronounced anisotropy is observed in the optical emission. This unexpected result can only be explained by assuming a symmetry breaking in the electronic wavefunction. Calculations reveal that slight differences between the arm diameters induce the polarized emission and a decrease in the photoluminescence intensity. © 2008 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevB.77.153303
DOI:
10.1103/PhysRevB.77.153303
PACS:
78.67.Bf, 61.46.Hk, 73.22.Dj
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