Phys. Rev. Lett. 69, 973–976 (1992)Giant electropleochroism in GaAs-(Al,Ga)As heterostructures: The quantum-well Pockels effectReceived 2 April 1992; published in the issue dated 10 August 1992 We report on the biaxial response of photoluminescence to electric fields in GaAs quantum-well structures. For fields along [001], emission due to nominally forbidden excitons exhibits substantial differences between [110] and [11¯0] polarizations. Transitions which are allowed within the envelope-function formalism show no noticeable anisotropy. In terms of symmetry, our observations relate to the linear electro-optic (Pockels) effect. The field dependence of the anisotropy is unusual in that it decreases with increasing field. Results can be qualitatively accounted for by perturbation analyses. © 1992 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.69.973
DOI:
10.1103/PhysRevLett.69.973
PACS:
78.20.Jq, 73.20.Dx, 73.40.Kp, 78.55.Cr
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