Phys. Rev. Lett. 58, 1264–1267 (1987)Optical properties of strained-layer superlattices with growth axis along [111]Received 8 December 1986; published in the issue dated 23 March 1987 We show that large piezoelectrically induced electric fields strongly modify the optical properties of [111] growth axis strained-layer superlattices with growth axis along [111]. These internal fields reduce the superlattice band gap, change optical matrix elements, and cause a spatial separation of photoexcited electrons and holes so as to screen the fields. Very large (χ3∼10-1 esu) optical nonlinearities occur because of the free-carrier screening of the strain-generated internal electric fields. © 1987 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.58.1264
DOI:
10.1103/PhysRevLett.58.1264
PACS:
73.40.Kp, 73.40.Lq, 78.40.Fy
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