Investigation of coupling in naturally occurring GaAs quantum dots

✍ Scribed by P.W. Kolb; H.D. Drew

• Book ID: 104084972
• Publisher: Elsevier Science
• Year: 2008
• Tongue: English
• Weight: 504 KB
• Volume: 40
• Category: Article
• ISSN: 1386-9477
• DOI: 10.1016/j.physe.2007.08.147

✦ Synopsis

We report on the photoluminescence (PL) imaging of GaAs quantum dots (QDs) formed by islands of quantized thicknesses in a 2 nm thick Al 0.3 Ga 0.7 As/GaAs/Al 0.3 Ga 0.7 As quantum well (QW) by means of near-field scanning optical microscopy. Discrete spectra associated with the QDs are observed and studied. Individual QDs are imaged with a resolution of 150 nm. Energy degeneracy which is sometimes observed between nearby QDs suggests the possibility of quantum mechanically coupled dots. Constraints on the observation of coupling are discussed.