Valence band mixing in GaAs-(AlGa)As heterostructures |
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| Authors: | R. Sooryakumar D.S. Chemla A. Pinczuk A.C. Gossard W. Wiegmann L.J. Sham |
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| Affiliation: | AT&T Bell Laboratories, Holmdel, NJ 07733, USA;AT&T Bell Laboratories, Murray Hill, NJ 07974, USA;Department of Physics University of California, La Jolla, CA 92093, USA |
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| Abstract: | In optical emission from electrons confined in quantum wells, the component with polarization normal to the planes was observed to be unexpectedly strong. This suggests a breakdown of the point group symmetry of the highest valence state beyond the reduction from cubic to laminar symmetry. Effective mass theories that include excitonic interactions and conventional symmetry-breaking mechanisms do not account for this phenomenon. |
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