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  • Quantum Electronics and Laser Science Conference
  • OSA Technical Digest (Optica Publishing Group, 1992),
  • paper QThD5

Experimental evidence of Bragg confinement of carriers in a quantum barrier

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Abstract

Trapping of earners over a quantum barrier by use of two superlattice (SL) sections separated by a wide spacer barrier layer has been proposed recently.1 Proper design can lead to a quantum state, that is mostly confined to the spacer region. In the conduction (valence) band, the proposed quantum state has a discrete energy level higher .(lower) than the band edge of the spacer barrier. Since this level corresponds to the first SL's mini-stop band, the SLs act as Bragg reflectors, leading to spatial localization of the carrier wave functions. A pre-requirement for the existence of the new quantum state is that the carrier wavefunction maintains its coherence over many SL periods.

© 1992 Optical Society of America

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